SPY-136: Do not timeout when waiting on the sasl mechs.

Since we also dont timeout on the return of the auth op, keeping
the process consistent. This avoids the situation where the server
is potentially rebooting and the timeout occurs. In combination with
code depending on the sasl list, exceptions can occur and the auth
thread dies.

Change-Id: I270e91e0794ea7de10cd26a9dafc85e35f87095d
Reviewed-on: http://review.couchbase.org/29657
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>