afr: heal metadata in discover code path

******************************************************
Backport of: https://review.gluster.org/18202
Also added loc_is_nameless() to libglusterfs since the patch that
introduced it in master was not backported to release-3.10.

Note: 18202 is a squash of  17850 and 18187 in master.
******************************************************

During graph switch, if fuse sends nameless (gfid) lookups, afr takes
the discover code path to serve it. If there are pending metadata heals,
they do not happen unless an inode refresh happens as a part of
discover (which is not guaranteed to happen always).

This patch fixes it by attempting metadata heal as a part of discover,
just like how it is done in lookup code path.

Change-Id: I87c493045b9225741cad173bf3f645848697032e
BUG: 1492010
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: https://review.gluster.org/18304
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

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