portmap: add support for registering multiple bricks on one port
portmap: add support for registering multiple bricks on one port

Rationale: if a brick serves multiple volumes, all of them need
to be registered for the port the brick server listens on.

Implementation: to register volumes "foo" and "bar" for port 6543,
you have to send a SIGNUP for brick: "foo bar", port: 6543.
Upon a pmap lookup, we match the search term to
whitespace tokenized bricknames on server side.

Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1570 (geosync related changes)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1570

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster