use new network roles to update the role os-network

The current os-network.rb is based on the recipe of each network
component.Currently, there are some new roles for each network
component. So I use the new network roles to update the role
os-network.

Change-Id: I6b705b9ff307e08089e6d31a5b57825c22fd0348
Closes-Bug: #1243997
fixed image download in vagrant environment

Change-Id: I95f64fb9392eb692274b511e01d70a0ba01534a9
Added some more vagrant testing steps

Also added `$` to front of all sample shell commands.
* Helps ensure user knows it is a command to be run from CLI
* Also discourages bulk copy/paste running of the commands directly from example ( bad practice! )

Change-Id: I7484d77dc3575bb9784ffa6b44437a4f02c63cc8
centos6 support...  well in theory anyways.

Change-Id: Id41cf82280197643b9aeafe045080c776460ce0c
Merge "use new network roles to update the role os-network"
Merge "fixed image download in vagrant environment"
Merge "centos6 support...  well in theory anyways."
Merge "Added some more vagrant testing steps"
remove unused packages cookbook

Change-Id: Ic9cdb406e877431990d5e7a28a55b86b12319c94
Cleanup of the Cirros steps for testing.

The Cirros image is now uploaded as part of the Vagrant run. Also the 'cirros'
user is needed for ssh-ing in.

Change-Id: I46f37429d16a9d4e6af22e7c2af6148d93767208
Merge "remove unused packages cookbook"