use shared node["osops"]["region"] attribute

remove node["nova"]["compute"]["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
sysfsutils is needed to attach an volume to an instance
move systool package to ubuntu section
remove extra libvirt_packages attribute
Update VERSION
Merge branch 'v4.2.1rc' of github.com:rcbops-cookbooks/nova into v4.2.1rc