Use old dict generator syntax in baremetal/test_ports

The old syntax is compatible with Python 2.6 as well.

Change-Id: I9397c92bde3aa2ea4f7831d1995fd52fe5e1788a
Add CLI test of "nova server-group-list"

Test case added for nova cli server-group-list

Change-Id: I04212576ca88bc6bf71db2e7ab8bf09d69124fdc
Merge "Use old dict generator syntax in baremetal/test_ports"
Merge "Add CLI test of "nova server-group-list""