Use name property in OS::Nova::Server if set

Currently the name property is ignored if specified; the intention
was to use the name as the nova server name if specified.

This is implemented by overriding physical_resource_name
in the same way as SwiftContainer.

Change-Id: I06a6f3d69119fb470eb54930c2bd7b329cabd6c7
Closes-Bug: #1229244
Require oslo.config 1.2.0 final

Now that 1.2.0 has been released, require it rather than one of the beta
release tarballs.

Closes-Bug: #1182861
Change-Id: I75ffc4a572d14488d19491a38742d6920951c171
Merge "Use name property in OS::Nova::Server if set"
Merge "Require oslo.config 1.2.0 final"