cluster/afr: trigger self-heals even when they are set to off.

When attempt-self-heal is set to true, trigger data/metadata/entry
self-heals even when they are disabled. This is useful for
gluster volume heal info to report them even when metadata-self-heal
entry-self-heal, data-self-heal are set to off.

Change-Id: Idc3f0d5d049c875b4f975248fef56ea2238da47c
BUG: 1039544
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/7480
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>