Rename and simplify foreman roles

The foreman roles, since they are already namespaces by the directory,
had an unnecessary prefix. This removes that prefix.
Also, change to use 'node_hostgroup' instead of
'foreman_node_hostgroup'.
Change the foreman playbook to match the new roles.
Add 'local_settings.sh' to gitignore. You can use local_settings.sh to
set env vars for run.sh, and source it.

Change-Id: Ie0aab279d7970de678702737be6ae16578e98a45
Fix log collection to use 'openstack_nodes'

Use the openstack_nodes group for log collection.
Remove the 'nodes' var override from the role, so it just uses 'nodes'

Change-Id: I2a033d740ea5e5d25807bcf74d98554e7117d9e6
Modifications to simplify and prepare for foreman usage

Take out some of the duplication in run.sh
Add support for NET_3 in settings.sh
Remove 'workaround' from default skiptag
Print out command to be executed

Change-Id: I317cff491e975b1f3a9de665c8440695c7c96532