PCBC-256: Added missing connect call for lcb management instances.

Management connections must still call lcb_connect to fetch topology
information and locate the cluster resources appropriately.  This was
not happening, causing all management operations to fail.

Change-Id: Icdcdf8ce453736292d0eb4f8c44d164264a79697
Reviewed-on: http://review.couchbase.org/30870
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Brett Lawson <brett19@gmail.com>