Exclude multiple port-scanner

Due to conflicts and missleading data multiple port-scanner need to be
deactivated.

This is currently done manually but should be done via the policy
resolver within ospd-openvas smoketests.

Change: limit openvas to maximal 8 cpus at 0.9 capacity

Instead of using all available CPUs ospd container within openvas
deployment is limited to 8 cpus with a 90% capacity.

In addition run-feature-tests is changed to sleep for a second on
each call within the ProgressHandler to ease up CPU usage.

Add: report result to mattermost message

After finishing the test runs the mattermost message will contain the
report result per run. This is done so that we can verify report
differences.

Additionally the test case is changed to full and fast instead of
discovery only.

Change: make executing tests easier, reduce amount og release artifacts

Since the testing will need a Makefile eitherway a clone is still
necessary therefore the release will not contain any deployment
definitions anymore but only the build test binary.

In addition a new command to download the latest release is added and
the all command is defined to deploy, execute and delete the containers
after testing.

Change: use action to setup go instead of apt-get

Change: add release ci