replace 'oc_' with dbtableprefix form config for temporary table names and indexes

lib/private/db/migrator.php

@@ -100,7 +100,7 @@ class Migrator {
 	 * @return string
 	 */
 	protected function generateTemporaryTableName($name) {
-		return 'oc_' . $name . '_' . $this->random->generate(13, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
+		return $this->config->getSystemValue('dbtableprefix', 'oc_') . $name . '_' . $this->random->generate(13, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
 	}
 
 	/**
@@ -151,7 +151,7 @@ class Migrator {
 				$indexName = $index->getName();
 			} else {
 				// avoid conflicts in index names
-				$indexName = 'oc_' . $this->random->generate(13, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
+				$indexName = $this->config->getSystemValue('dbtableprefix', 'oc_') . $this->random->generate(13, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
 			}
 			$newIndexes[] = new Index($indexName, $index->getColumns(), $index->isUnique(), $index->isPrimary());
 		}