get_provider_type not compatible with juju2

The get_provider_type helper is not compatible with Juju2.

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Create sdn on overcloud
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2017-02-10 19:39:32 [INFO] Pulling secrets from /srv/mojo/LOCAL/openstack/specs/full_stack/next_deploy/mitaka/ to /srv/moj
/openstack/xenial/_20171310_191320/local
2017-02-10 19:39:32 [WARNING] Automatic secrets phase ran but secrets directory /srv/mojo/LOCAL/openstack/specs/full_stack
next_deploy/mitaka/ does not exist!
2017-02-10 19:39:32 [INFO] Running script network_setup.py
2017-02-10 19:39:34 [ERROR] 2017-02-10 19:39:34 [INFO] Setting up gre network
2017-02-10 19:39:34 [INFO] Using config /srv/mojo/openstack/xenial/_20171310_191320/spec/specs/full_stack/next_deploy/mita
a//network.yaml
2017-02-10 19:39:34 [INFO] Consuming network environment variables as overrides.
2017-02-10 19:39:34 [INFO] Network info: default_gateway: 10.7.0.1
end_floating_ip: 10.7.200.254
external_dns: 10.111.222.2
external_net_cidr: 10.7.0.0/16
external_net_name: ext_net
external_subnet_name: ext_net_subnet
network_type: gre
private_net_cidr: 192.168.21.0/24
router_name: provider-router
start_floating_ip: 10.7.150.0

Traceback (most recent call last):
  File "/srv/mojo/openstack/xenial/_20171310_191320/spec/specs/full_stack/next_deploy/mitaka/network_setup.py", line 108,
n <module>
    sys.exit(main(sys.argv))
  File "/srv/mojo/openstack/xenial/_20171310_191320/spec/specs/full_stack/next_deploy/mitaka/network_setup.py", line 85, i
 main
    if mojo_utils.get_provider_type() == 'openstack':
  File "/srv/mojo/openstack/xenial/ROOTFS/srv/mojo/openstack/xenial/_20171310_191320/spec/helper/setup/utils/mojo_utils.py
, line 250, in get_provider_type
    return juju_env_contents['environments'][juju_env]['type']
KeyError: 'dima-overcloud:admin/release-testing'