storageServer: remove dead code from getSessionInfo

storageServer -> getSessionInfo:
cleanup of unused code ('sessions' varibale is never used).

Change-Id: Idd93fd7d0257caea60bb3981ec1a6604e0dcc723
Signed-off-by: Daniel Erez <derez@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34537
Reviewed-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>