client: add the domainsMap in connectStoragePool

This patch adds the client side support for the pool metadata memory
backend. The server side support was introduced in patch:

 b98c448 sp: receive domains map in connectStoragePool

Change-Id: I5c3037456ac045b7ac03043bb2f46ccd48b67045
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/24491
Reviewed-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>