get_security_groups now creates default security group

If one called get_security_groups() previously the default security
group would not be created until the tenant created a network. This
exposed a bug when an admin creates a shared network and a tenant tried
to boot a vm on it without having any networks.

Fixes bug 1171997

Change-Id: I899203424c03353a1ee6567c9ddbaecd7dc25001
Allow ports to be created on networks that do not exist in NVP

If a network exists in the quantum database but not in NVP we should allow
someone to create a port on this network and set the status to ERROR. The
reason for this is if one deletes a network from NVP and when the dhcp agent
goes to create it's dhcp port on this network an error will be raised to the
agent and it will enter a constant state of resyncing.

This patch also adds a unit test for update_port() for the same situation.

Fixes bug 1179327

Change-Id: Ie77fc48d11644b820c0cc3b3fa341856e36f8511
Fix ./run_tests.sh --pep8

Create a common script to call flake8 to share flake8 options and
make tox and run_tests.sh use this script.

Fixes bug: 1179331

Change-Id: I92dc54fa3f4bb22aa39bde226b6d769088f9a2e3
Imported Translations from Transifex

Change-Id: Ie5ff2a1f033c57b690b3a71be9f93b32d8db0b73
Merge "Fix ./run_tests.sh --pep8"
Merge "get_security_groups now creates default security group"
Merge "Allow ports to be created on networks that do not exist in NVP"