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 #91 from claco/issue-597

Merged automatically by jenkins after successful build test
use global 'region' attr
Merge pull request #92 from invsblduck/issue593_region

Merged automatically by jenkins after successful build test
Remove unused l3-agent attributes
Add and gather LBaaS attributes
Remove extraneous whitespace
Remove unused variables
Fix incorrect config file path
Add device_driver attribute
Add "enabled" attribute to "lbaas" hash
Remove unused variables/attributes
Merge pull request #93 from Apsu/lbaas_fixes

Merged automatically by jenkins after successful build test
Merge branch 'v4.2.1rc' of github.com:rcbops-cookbooks/nova-network into v4.2.1rc
Update VERSION