Remote nova/compute/region attr dependency

This is currently breaking non-nova related builds (like
swift-lite/spc) that use keystone by don't rely on having the nove cookbook.
Merge pull request #146 from claco/remove-nova-attr-dep

Merged automatically by jenkins after successful build test
Add SSLCertificateChainFile to service-api endpoint
Make cert chain optional and apply across all vhosts
Properly make cert chain optional
Set a Nil value default attribute for chain_file
Adjust ssl chain_file checks to fix internal and admin api
Merge pull request #147 from odyssey4me/GH595

Add SSLCertificateChainFile to service-api endpoint