GlusterFS: Using mount method in RemoteFsClient

GlusterFS: Using mount method in RemoteFsClient

This patch modifies the glusterfs driver code to use "mount" method
in RemoteFsClient class.

This patch does the following:
 * Corrects the passing parameters while creating the object of
RemoteFsClient class.
 * Calls the "mount" method in RemoteFsClient to mount GlusterFS
volumes instead of "_do_mount" method in RemoteFSDriver class.
 * Also removes "_do_mount" method RemoteFSDriver class, as it is
not required now.

Closes-Bug: 1433520
Change-Id: I3bfc76fc3228282a741c5265eb06c4974a696b29