Merge pull request #2 from achirko/nat-develop

Nat develop
Add vcloud_config property to the FloatingIP node
Add floating ip node to manager blueprint
Add more logging
Don't delete network if we using external resource
Fixes

Fix ip_allocation_mode usage.
Add logging.
Remove unused code.
add check ip addresses
add existiong rule check
refactoring
refactoring floating ip functions
style fixes
syntax error fixes
Merge branch 'nat-develop' of https://github.com/achirko/tosca-vcloud-plugin into nat-develop
add logger info
Conflicts:
	network_plugin/floatingip.py