feature: add support for carbon ODL release.

Charm Config Used:

  odl-controller:
    charm: cs:~openstack-charmers-next/odl-controller
    num_units: 1
    options:
      install-url: "https://nexus.opendaylight.org/content/groups/public/org/opendaylight/integration/distribution-karaf/0.6.0-Carbon/distribution-karaf-0.6.0-Carbon.tar.gz"
      profile: "openvswitch-odl-carbon"
    annotations:
      gui-x: '648.5'
      gui-y: '452'
    to:
    - lxd:0
  neutron-api-odl:
    charm: cs:~openstack-charmers-next/neutron-api-odl
    annotations:
      gui-x: '533.4999389648438'
      gui-y: '274'
    options:
      vlan-ranges: "physnet2:1000:2000"
      overlay-network-type: "vxlan gre"
      security-groups: "true"

with Openstack Xenial:Ocata.

Resulting Error:
2017-06-26 19:06:19 INFO config-changed Traceback (most recent call last):
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/config-changed", line 133, in <module>
2017-06-26 19:06:19 INFO config-changed main()
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/config-changed", line 117, in main
2017-06-26 19:06:19 INFO config-changed hooks.execute(sys.argv)
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/charmhelpers/core/hookenv.py", line 731, in execute
2017-06-26 19:06:19 INFO config-changed self._hooks[hook_name]()
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/charmhelpers/core/host.py", line 639, in wrapped_f
2017-06-26 19:06:19 INFO config-changed restart_functions)
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/charmhelpers/core/host.py", line 661, in restart_on_change_helper
2017-06-26 19:06:19 INFO config-changed r = lambda_f()
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/charmhelpers/core/host.py", line 638, in <lambda>
2017-06-26 19:06:19 INFO config-changed (lambda: f(*args, **kwargs)), restart_map, stopstart,
2017-06-26 19:06:19 INFO config-changed File "/var/lib/juju/agents/unit-odl-controller-0/charm/hooks/config-changed", line 56, in config_changed
2017-06-26 19:06:19 INFO config-changed process_odl_cmds(PROFILES[config["profile"]])
2017-06-26 19:06:19 INFO config-changed KeyError: u'openvswitch-odl-carbon'
2017-06-26 19:06:19 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1

It seems Carbon Release Support needs to be added.

Kind Regards
  Fatih E.