mgmt/glusterd: enable valgrind usage even in non DEBUG build

* Till now running glusterfs processes were allowed to run in valgrind
  mode only when built with debug mode enabled.

Change-Id: I11e07ea2a4da4f82f70cdded6258a22d65d6db64
BUG: 922877
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/4688
Reviewed-by: Anand Avati <avati@redhat.com>
Tested-by: Anand Avati <avati@redhat.com>