COOPR-324 make sure all system generated hostnames have labels
that do not exceed 63 characters.
Also lowercasing the entire hostname for consistency since they
should be case insensitive anyway.
remove unused comment.
COOPR-324 strip leading digits from hostnames to make it a bit
easier for plugin writers who may rely on older code that thinks
it is not ok for a hostname to start with a digit.
Merge pull request #644 from caskdata/feature/COOPR-324-fix-hostnames

COOPR-324 make sure all system generated hostnames have labels