Restore ability to run functional tests with run_tests.sh

Change f20b1d42 which split the running of functional tests from
the running of unit tests caused running:
  ./run_tests.sh neutron.tests.functional
to fail as the OS_TEST_PATH variable will be defaulted to
neutron.tests.unit which means that the functional tests will not
be discovered in the above case.

This patch trys to detect an argument passed in the form of a
neutron.tests string and correctly sets the OS_TEST_PATH variable
based on it.

Change-Id: I8ccdc7f10d3c8478281aeaf8d02175d0eeb8d6e9
Fix KeyError exception while updating dhcp port

This is caused by a missing network_id in the port body.
This patch adds it so that a warning message can be traced
correctly. Wording is slightly tweaked to ensure it applies
to the right context.

Closes-bug: #1324194

Change-Id: I4b67b5c3584aa33278eb0e9e879ca338ba0ca8b0
Updated from global requirements

Change-Id: I91778ac6d505f8808a359765555a1619c2f34d3c
FWaaS plugin doesn't need to handle firewall rule del ops

If firewall rule is attached to firewall policy, it would raise
FirewallRuleInUse excpetion in DB ops, else it is a pure DB delete ops.
So it is useless to handle delete_firewall_rule ops in fwaas plugin.
Closes-Bug: #1322076

Change-Id: I55a000d206f232c79b41230f526007f684db8f4f
Merge "FWaaS plugin doesn't need to handle firewall rule del ops"
Merge "Fix KeyError exception while updating dhcp port"
Merge "Updated from global requirements"
Merge "Restore ability to run functional tests with run_tests.sh"
Imported Translations from Transifex

Change-Id: I224b5013b66c3a571018036678f30e7ab5848200