Fix stackrc for containerized undercloud

Commit 5a400f8011 broke the stackrc for
the containerized undercloud, making all the openstack commands fail
with:

  Cannot use v2 authentication with domain scope

This replaces the OS_TENANT_NAME variable with OS_PROJECT_NAME to and
switch to versionless auth_url to use keystone v3 instead.

Change-Id: I869adb75294b38c61e508870a69e1637bb410a94
Closes-Bug: #1719796

extraconfig/post_deploy/undercloud_post.sh

@@ -13,7 +13,7 @@ export OS_AUTH_TYPE=password
 export OS_PASSWORD=$admin_password
 export OS_AUTH_URL=$auth_url
 export OS_USERNAME=admin
-export OS_TENANT_NAME=admin
+export OS_PROJECT_NAME=admin
 export COMPUTE_API_VERSION=1.1
 export NOVA_VERSION=1.1
 export OS_NO_CACHE=True

extraconfig/post_deploy/undercloud_post.yaml

@@ -85,9 +85,9 @@ resources:
               scheme: http
               host: {get_param: [DeployedServerPortMap, 'control_virtual_ip', fixed_ips, 0, ip_address]}
               port: 5000
-              path: /v2.0
+              path: /
           - make_url:
               scheme: https
               host: {get_param: [DeployedServerPortMap, 'public_virtual_ip', fixed_ips, 0, ip_address]}
               port: 13000
-              path: /v2.0
+              path: /