Convert TEST_*_PROXY to *_proxy env vars in neutron setup

If TEST_{NO,HTTP,HTTPS}_PROXY are provided, convert them to
http_proxy etc so that code will use them. Here we apply to
neutron.setup.

Author: dosaboy

zaza/openstack/charm_tests/neutron/setup.py

@@ -30,7 +30,6 @@
 
 import zaza.charm_lifecycle.utils as lifecycle_utils
 
-
 # The overcloud network configuration settings are declared.
 # These are the network configuration settings under test.
 OVERCLOUD_NETWORK_CONFIG = {
@@ -80,6 +79,14 @@
     "fip_service_subnet_cidr": "100.64.0.0/24"
 }
 
+# Set proxy vars if provided so that all code gets to use it.
+for key, val in os.environ.items():
+    if not key.startswith('TEST_') or 'PROXY' not in key:
+        continue
+
+    _key = key.partition('TEST_')[2]
+    os.environ[_key.lower()] = val
+
 
 def undercloud_and_charm_setup(limit_gws=None):
     """Perform undercloud and charm setup for network plumbing.