Code review fixes.

This commit included fixes and improvments rquested in code review
feedback.

Biggest change is to move all code from {crowbar,network} barclamp
to quantum barclamp.
Add missing template file

Fetched from https://github.com/crowbar/barclamp-network/pull/200
Install the cisco-plugin
Keep the cisco related changes isolated in the quantum barclamp

The cisco_topology view now uses QuantumService.get_cisco_switch_value() to
find out the cisco port mapping for a node. This addresses:

https://github.com/crowbar/barclamp-crowbar/pull/637/files#r5445500
Several fixes for the cisco_topology view

- fix form's destination url
- fix position of the submit button
- Add a title
Fix the cisco_nexus.ini template

- Only generate one [[switch-IP]] section per switch-ip. It was previously
generating a separate section per node.

- Add empty line to improve readability of the generated file.
remove unneeded INVENTORY section from cisco_plugins.ini