[fullhash] [rrl] add getFullHash() method to LabelSequence to get more unpredicable hash.
[fullhash] s/isc/bundy/
[fullhash] updated method documentation with some more details.
[fullhash] extended LabelSequence unit test to cover getFullHash().
Refactor the new getFullHash() and the old getHash() into a single call.
Merge pull request #29 from bundy-dns/fullhash-refactor

Fullhash refactor