logrotate: gluster logrotate config should not be global

Issue : Previously glusterfs logrotate config file pollutes
global config. So moved the directives inside the curly braces,
 so they don't pollute the global config state.

Change-Id: I8836893dfcdf457d9c5d766612d687bfce64e2ae
BUG: 1158456
"Signed-off-by: Lalatendu Mohanty <lmohanty@redhat.com>"
"Reviewed-on: http://review.gluster.org/8994"
"Reviewed-by: Niels de Vos <ndevos@redhat.com>"
"Tested-by: Gluster Build System <jenkins@build.gluster.com>"
(cherry picked from commit a5d73daabf6df95bc73b186d92f3e2d1239a6f8a)
Signed-off-by: Lalatendu Mohanty <lmohanty@redhat.com>
Reviewed-on: http://review.gluster.org/9000
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>