Remove warning about WAL encryption being unstable

In the next release the WAL encryption will no longer be in beta testing
and the on disk format is guaranteed to be stable going forward.

contrib/pg_tde/expected/access_control.out

@@ -64,7 +64,6 @@ ERROR:  must be superuser to access global key providers
 SELECT pg_tde_set_default_key_using_global_key_provider('key1', 'global-file-provider');
 ERROR:  must be superuser to access global key providers
 SELECT pg_tde_set_server_key_using_global_key_provider('key1', 'global-file-provider');
-WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 ERROR:  must be superuser to access global key providers
 SELECT pg_tde_delete_default_key();
 ERROR:  must be superuser to access global key providers

contrib/pg_tde/expected/delete_principal_key.out

@@ -150,7 +150,6 @@ SELECT pg_tde_set_key_using_global_key_provider('test-db-key','file-provider');
 (1 row)
 
 SELECT pg_tde_set_server_key_using_global_key_provider('test-db-key','file-provider');
-WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
  pg_tde_set_server_key_using_global_key_provider 
 -------------------------------------------------
  

contrib/pg_tde/expected/key_provider.out

@@ -245,7 +245,6 @@ SELECT pg_tde_create_key_using_global_key_provider('server-key', 'global-provide
 (1 row)
 
 SELECT pg_tde_set_server_key_using_global_key_provider('server-key', 'global-provider');
-WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
  pg_tde_set_server_key_using_global_key_provider 
 -------------------------------------------------
  
@@ -319,7 +318,6 @@ ERROR:  key provider name cannot be null
 SELECT pg_tde_set_key_using_global_key_provider('key', NULL);
 ERROR:  key provider name cannot be null
 SELECT pg_tde_set_server_key_using_global_key_provider('key', NULL);
-WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 ERROR:  key provider name cannot be null
 -- Setting principal key fails if key name is NULL
 SELECT pg_tde_set_default_key_using_global_key_provider(NULL, 'file-keyring');
@@ -329,7 +327,6 @@ ERROR:  key name cannot be null
 SELECT pg_tde_set_key_using_global_key_provider(NULL, 'file-keyring');
 ERROR:  key name cannot be null
 SELECT pg_tde_set_server_key_using_global_key_provider(NULL, 'file-keyring');
-WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 ERROR:  key name cannot be null
 -- Empty string is not allowed for a principal key name
 SELECT pg_tde_create_key_using_database_key_provider('', 'file-provider');
@@ -364,7 +361,6 @@ SELECT pg_tde_set_key_using_global_key_provider('not-existing', 'file-keyring');
 ERROR:  key "not-existing" does not exist
 HINT:  Use pg_tde_create_key_using_global_key_provider() to create it.
 SELECT pg_tde_set_server_key_using_global_key_provider('not-existing', 'file-keyring');
-WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 ERROR:  key "not-existing" does not exist
 HINT:  Use pg_tde_create_key_using_global_key_provider() to create it.
 DROP EXTENSION pg_tde;

contrib/pg_tde/src/catalog/tde_principal_key.c

@@ -593,9 +593,6 @@ pg_tde_set_server_key_using_global_key_provider(PG_FUNCTION_ARGS)
 	char	   *principal_key_name = PG_ARGISNULL(0) ? NULL : text_to_cstring(PG_GETARG_TEXT_PP(0));
 	char	   *provider_name = PG_ARGISNULL(1) ? NULL : text_to_cstring(PG_GETARG_TEXT_PP(1));
 
-	ereport(WARNING,
-			errmsg("The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!"));
-
 	/* Using a global provider for the global (wal) database */
 	pg_tde_set_principal_key_internal(GLOBAL_DATA_TDE_OID,
 									  GLOBAL_DATA_TDE_OID,

contrib/pg_tde/t/expected/crash_recovery.out

@@ -17,7 +17,6 @@ SELECT pg_tde_set_server_key_using_global_key_provider('wal_encryption_key', 'gl
  
 (1 row)
 
-psql:<stdin>:1: WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 SELECT pg_tde_add_database_key_provider_file('db_keyring', '/tmp/crash_recovery.per');
  pg_tde_add_database_key_provider_file 
 ---------------------------------------
@@ -56,7 +55,6 @@ SELECT pg_tde_set_server_key_using_global_key_provider('wal_encryption_key_1', '
  
 (1 row)
 
-psql:<stdin>:1: WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 SELECT pg_tde_create_key_using_database_key_provider('db_key_1', 'db_keyring');
  pg_tde_create_key_using_database_key_provider 
 -----------------------------------------------
@@ -86,7 +84,6 @@ SELECT pg_tde_set_server_key_using_global_key_provider('wal_encryption_key_2', '
  
 (1 row)
 
-psql:<stdin>:1: WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 SELECT pg_tde_create_key_using_database_key_provider('db_key_2', 'db_keyring');
  pg_tde_create_key_using_database_key_provider 
 -----------------------------------------------

contrib/pg_tde/t/expected/replication.out

@@ -80,7 +80,6 @@ SELECT pg_tde_set_server_key_using_global_key_provider('test-global-key', 'file-
  
 (1 row)
 
-psql:<stdin>:1: WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 CREATE TABLE test_enc2 (x int PRIMARY KEY) USING tde_heap;
 INSERT INTO test_enc2 (x) VALUES (1), (2);
 ALTER SYSTEM SET pg_tde.wal_encrypt = 'on';

contrib/pg_tde/t/expected/wal_encrypt.out

@@ -25,7 +25,6 @@ SELECT pg_tde_set_server_key_using_global_key_provider('server-key', 'file-keyri
  
 (1 row)
 
-psql:<stdin>:1: WARNING:  The WAL encryption feature is currently in beta and may be unstable. Do not use it in production environments!
 SELECT pg_tde_verify_server_key();
  pg_tde_verify_server_key 
 --------------------------