Connecting using a custom manager port takes a long time

If you're specifying a custom port when connecting to Couchbase, it can take a long while to connect, and the connector will log lots of warnings about being unable to connect to the KV service.

The workaround is to bootstrap using a KV port (default 11210) instead of a manager port (default 8091), and to explicitly tag the port as belonging to the KV service, like this:

    hosts = ['example.com:12345=kv']