Handle release of 5.6.1
Handle release of 5.6.1

* Add a version constant for 5.6.2 so that the 5.6.1 constant
represents the 5.6.1 release and the 5.6.2 constant represents
the unreleased 5.6 branch.

vroyer/elasticassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elasticassandra,strapdata/elassandra,vroyer/elasticassandra,vroyer/elassandra,vroyer/elassandra,vroyer/elassandra