Update README and common.yaml

README now includes simpler librarian-puppet-simple installation,
and references the fact that you may need to change your scenario.

Also, an update to common.yaml, and all_in_one.yaml for
more complete suppport of the all_in_one scenario
Merge pull request #121 from bodepd/revert_cisco_module_update

Revert "Use cisco rabbitmq and mysql modules"
Merge pull request #100 from bodepd/ha_config

Add HA specific config
Merge pull request #117 from robertstarmer/master

Update README and common.yaml
Updates so that vagrant can work on slower hardware

The following updates ensure that the vagrant tests
can work on slower hardware than what I was using before.

Updates the amount of memory per VM (on worse hardware,
things start thrashing in a way that leads to build failures)

Increase the sleep time to give it more time to set up
networking so that the floating ip allocation will actually
work.