rbd: improve Windows remap failure handling

rbd: improve Windows remap failure handling

At the moment, if an image can't be remapped when the centralized
RBD service starts, the service will stop and already started
daemons will continue running.

This change adds a new option: "--remap-failure-fatal". If set,
when an image can't be remmaped, the service stops AND cleans up
the running daemons. By default, an error will be logged and the
service will continue running.

Signed-off-by: Lucian Petrut <lpetrut@cloudbasesolutions.com>