added fake-saslauthd.rb which mocks saslauthd for easy testing
added fake-saslauthd.rb which mocks saslauthd for easy testing

Change-Id: I92b374ed836f04a80151e53e131eb4bcc3868a65
Reviewed-on: http://review.couchbase.org/43975
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

couchbase/cbauth,couchbase/cbauth