weston-init: add profile to point users to global socket

Add profile script to point users capable of interacting with the global
socket to it by default.

Signed-off-by: Randolph Sapp <rs@ti.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 2818cbc7)
Signed-off-by: Steve Sakoman <steve@sakoman.com>