Added checks for tcp port and image for savanna

1. Added tcp port checks and image tags checks for savanna
2. Changed savanna tests descriptions

Change-Id: I06db6a927626093d73a8e5ad0bb969d11360557b
Test fixes

Some non-major fixes to unit tests of wsgi controllers and functional
tests.

Savanna/Murano deployment tags add

Function discovery_check from wsgi_utils.py has been modified: all logic
that provides creation of set of deployment_tags was moved to function
_get_cluster_depl_tags (_request_to_nailgun replacement) which also handle
all requesting process to nailgun. nailgun_mimic.py was modified to
support providing of new fixture data for testing purposes. Tests for
function _get_cluster_depl_tags were added in new file
test_support_utilities.py.

Unified deployment tags.

For nose discovery plugin unified treating (casting to lower case) of deployment tags for
testsets and tests were added. Unit tests were modified in order to
support new logic.

Change-Id: Iee8459e77dd5a56cf69aecdc03e61ddff58c784a
Merge "Added checks for tcp port and image for savanna"