Fix runtestmanager for CICD deployments

In CICD deployments, there are no workarounds that install
docker.io before using 'runtest' formula.
Add preparation of necessary packages to runtestmanager.

- Refactor RuntestManager to use salt CLI instead of salt API
  because salt API dones't allow to catch errors from modules
- Add preparations for docker packages, Neutron private and
  public networks based on underlay.yaml address pools, etc.

Change-Id: Iaff8046b9cde6185cd6718a5c2064998ea7dc507
diff --git a/tcp_tests/settings.py b/tcp_tests/settings.py
index 0d79cc4..9ebdf22 100644
--- a/tcp_tests/settings.py
+++ b/tcp_tests/settings.py
@@ -85,3 +85,6 @@
 SL_TEST_REPO = os.environ.get('SL_TEST_REPO',
                               'https://github.com/Mirantis/stacklight-pytest')
 SL_TEST_COMMIT = os.environ.get('SL_TEST_COMMIT', 'master')
+
+EXTERNAL_ADDRESS_POOL_NAME = os.environ.get('EXTERNAL_ADDRESS_POOL_NAME',
+                                            'external-pool01')