Initial change to support heat-based environments

Moved the patch from the mcp/mcp-qa repo, ref #1170 to
not lose it after cleaning up.

1.Added envmanager_heat.py to create environment in OpenStack
  and use the created heat stack as the metadata source.
  Current conventions for heat stack metadata:
  - OS::Nova::Server must use 'metadata' property to specify list
    of the node roles, example:

    cfg01_node:
      type: OS::Nova::Server
      ...
      properties:
        ...
        metadata:
          roles:
          - salt_master

  - OS::Neutron::Subnet must use 'tags' property to specify the
    address pool name (L3 network roles), example:

    control_subnet:
      type: OS::Neutron::Subnet
      properties:
        ...
        tags:
        - private_pool01
2. Change underlay.yaml to use the user data file 'as is', without
   indents and jinja blocks. This will allow to use the same
   user data file for fuel-devops envs and heat stack envs.

3. Add an example microcloud-8116.env file with some defaults.
   For other stacks, another .env files can be created, with different
   access keys, networks, images, ...

Related-Bug: PROD-27687

Change-Id: Iaa9e97447bd1b41e5930a1ffbb7312945ba139f4
diff --git a/tcp_tests/requirements.txt b/tcp_tests/requirements.txt
index 2c0f1d9..d9eae28 100644
--- a/tcp_tests/requirements.txt
+++ b/tcp_tests/requirements.txt
@@ -23,3 +23,7 @@
 python-jenkins
 cmd2<0.9
 PyYAML!=5.1
+
+# For Queens: https://github.com/openstack/requirements/blob/stable/queens/global-requirements.txt
+python-heatclient>=1.10.0
+keystoneauth1>=3.3.0
\ No newline at end of file