Catching remoteError while communicate with supervdsm

When remoteError is raised due to broken communication with supervdsm,
try to reconnect to supervdsm socket and raise runtime exception.
If fails to reconnect, vdsm calls panic and restarts itself.

Change-Id: Ib2f9cab9e4d138063ebe0f2f3214b4e0b053a364
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/17066
Reviewed-by: Dan Kenigsberg <danken@redhat.com>