Merge pull request #135 from Cerberus98/ip_addresses_submod

Moves IP Address into their own module.

LGTM and tests pass
Merge pull request #137 from Cerberus98/ports_submod

Ports submod

Tests pass.  The test count was lower, but I bet it is up after the merge
Pulls routes out into a submodule

Refactors plugin.py and associated tests to pull routes out into their
own submodule for improved plugin readability.
Moves subnets into a submodule

Refactors plugin.py by moving subnets functions and their associated
tests into submodules for better plugin readability.
Moves networks into a submodule

Refactors plugin.py by moving networks functions and their associated
tests into separate submodules for easier plugin readability.
Moves quota config back to plugin

Moves the quota configuration lines back into plugin.py which in turn
solves a weird dependency issue when loading the Quark quota driver via
the neutron.conf.