adjust default cpu and ram allocation ratios

As per support discussion, modify:

nova_cpu_allocation_ratio = 2.0
nova_ram_allocation_ratio = 1.0

Also add commented entry to user_variables to allow overriding
Refactor swift_rings.py ring builder

* Move the logic out into ansible/templates
* Let the ring_builder just build the ring based on a list of devices
* Allows us to not have to specify the storage/repl ip as long as the bridge is specified

Fixes #603
Improve container network descriptions

I improved the container network descriptions in the
rpc_user_config files.

Fixes rcbops/privatecloud-docs#736
Add F5 Monitoring Script

Adding the script that the F5 uses to properly monitor api pool members.

Issue #605
Merge pull request #613 from claco/issue-605

Add F5 Monitoring Script
Merge pull request #579 from mancdaz/master-470

adjust default cpu and ram allocation ratios
Merge pull request #612 from rcbops/msk/issue736

Improve container network descriptions
Merge pull request #604 from andymcc/ring_refactor

Refactor swift_rings.py ring builder