Fix broken couchbase.{_to,_from}_json
Fix broken couchbase.{_to,_from}_json

These two methods were broken because they would just return the
function and not the actual encoded/decoded values

These methods were only used for serializing MutationStates, and
therefore were not actually tested anywhere

Change-Id: Icd74c88406525fdb8c2108e5fcdff62e67a2cff2
Reviewed-on: http://review.couchbase.org/62956
Tested-by: Mark Nunberg <dab05a0fe859c5cb93882b2a75a0d613501b07be@couchbase.com>
Reviewed-by: Will Gardner <cbd6f5d9092d9ef7d5c0510d53bba134b22c02f2@couchbase.com>

couchbase/couchbase-python-client,couchbase/couchbase-python-client