This patch does following.

1. Enable ctime feature by default.

2. Earlier, to enable the ctime feature, two options
   needed to be enabled
     a. gluster vol set <volname> utime on
     b. gluster vol set <volname> ctime on

   This is inconvenient from the usability point of
   view.  Hence changed it to following single option

     a. gluster vol set <volname> ctime on

fixes: bz#1624724
Change-Id: I04af0e5de1ea6126c58a06ba8a26e22f9f06344e
Signed-off-by: Kotresh HR <khiremat@redhat.com>

Lookup on root was sending "/" as the path.
This will break the basename calculation in
loc_copy and hence lookup on root was failing
if the loc_copy was involved in the stack.

With ctime, a first lookup on root initiates
a metadata self heal because of ctime xattr
not being same on all afr subvolumes. This
results in loc_copy and hence the failure
of lookup.

Fix would be to send path with "." for the root.

fixes: bz#1582516
Change-Id: Iafe4b99f249a4f5034ad34c1d30590de0e35aa0d
Signed-off-by: Kotresh HR <khiremat@redhat.com>