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
Remove redundant default=None for config options

By default the cfg modules set the default value as None. There
is no reason to set this.

Change-Id: I58e09e01760b573612c2ee169a8dd1784fd36a82
Support 'infinite' dhcp_lease_duration

Process a dhcp_lease_duration value of -1 as 'infinite'
when setting the dnsmasq dhcp-range values to support
cases where it is undesirable for instance dhcp leases
to expire.

DocImpact

Closes-Bug: #1315430
Change-Id: I1cc3cfebfec355014e6d5b5cbd656a1300c43c0b
Disallow regular user to update firewall's shared attribute

Shared firewalls should only be operable by  admins.
Currently only admin can provide shared attribute at firewall creation,
so update_firewall should be consistent with that as well.

Change-Id: I093743514637824207b375d724404d51f778d012
Closes-Bug: #1323322
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
Revert "fix openvswitch requirement check"

This reverts commit be340d1bab015c47650687f97393c6c9015fb537.

The fix did not fix anything.
See comments at
https://review.openstack.org/#/c/95592/

Change-Id: I2926acf4b0a7020a7ad3237e6d03d5b78bfcb6c4
Merge "Remove redundant default=None for config options"
Merge "Support 'infinite' dhcp_lease_duration"
Merge "Revert "fix openvswitch requirement check""
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"