CCBC-501: Change capath to certpath, undocument no_verify

This makes the behavior more in line with the behavior expected for the
3.0 server release, where third-party signed certificates are not
supported.

Additionally, the no_verify option has been undocumented in order to
allow the strict dependency of the certificate to be more evident.

Change-Id: I95d0ae4c9599f9610ad97f24b13dd2e34db93baa
Reviewed-on: http://review.couchbase.org/40920
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>