use global 'region' attr
Use new get_mysql_endpoint method in osops-utils

Start converting various cookbooks to use the new #get_mysql_endpoint method
which now allows people to point to a non-chef managed mysql server for all
things.

See rcbops/chef-cookbooks#597
Update VERSION
Merge branch 'v4.2.1rc' of github.com:rcbops-cookbooks/glance into v4.2.1rc