allow to remove and change mount points

lib/private/files/mount/manager.php

@@ -23,6 +23,13 @@ class Manager {
 		$this->mounts[$mount->getMountPoint()] = $mount;
 	}
 
+	/**
+	 * @param string $mountPoint
+	 */
+	public function removeMount($mountPoint) {
+		unset($this->mounts[$mountPoint]);
+	}
+
 	/**
 	 * Find the mount for $path
 	 *

lib/private/files/mount/mount.php

@@ -65,6 +65,13 @@ class Mount {
 		return $this->mountPoint;
 	}
 
+	/**
+	 * @param string $mountPoint new mount point
+	 */
+	public function setMountPoint($mountPoint) {
+		$this->mountPoint = $mountPoint;
+	}
+
 	/**
 	 * create the storage that is mounted
 	 *