Watcher: Fix endless repair tries for broken secondary

Watcher: Fix endless repair tries for broken secondary

In cases where secondary was offline and not evacuated watcher tried
to activate-disks in an endless manner, but this is useless, as the
secondary is offline and therefore not responding to this approach.

This patch skips activation of the disk if the secondary is bad but
instance up and running.

Signed-off-by: René Nussbaumer <rn@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>