Add environment variable to disable CCCP

In testing environments with either mock or cluster_run, port 11210 may
not exist, or worse, may be part of a different cluster than intended.

While in the unit tests in LCB we manually specify the memcached ports,
this may not be possible with wrapping SDKs, especially of older
versions

Change-Id: Ib1a5499ec08b698dbcf9139d7321628ba4d85d0c
Reviewed-on: http://review.couchbase.org/32915
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>