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
Merge pull request #20 from claco/issue-597

Merged automatically by jenkins after successful build test
use global 'region' attr
Merge pull request #21 from invsblduck/issue593_region

Merged automatically by jenkins after successful build test