Before, we required all servers that are up and reacheable
to agree that object is dark before we considered it as such
and triggered an action. But now that someone wanted to
run with action=delete, a concern was raised that a momentary
network split could easily make the watcher start deleting
objects. To guard against it, we now require all servers
in the whole ring agree than object is dark. As a side effect,
if one of container servers is down, the watcher is effectively
disabled now. But seems like a better choice than deleting
something by mistake.
Change-Id: I07fa2d39817bd34f7873731990e12ab991e14a6b
92aef484b6