Made spelling changes to 19 files

Change-Id: If91cf44578fe0b5176ea01ae5c5962e31606f640
BUG: 1075417
Signed-off-by: AkshataDM <oxta28@gmail.com>
Reviewed-on: http://review.gluster.org/7280
Reviewed-by: Varun Shastry <vshastry@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>
Tested-by: Anand Avati <avati@redhat.com>