GitLab

Implemented agent deployment using script downloaded from the server.
The script installs deb/rpm packages with stork agent. Then the script
registers current machine in the server performing key and certs
exchange. Enabled TLS to gRPC traffic between agent and server
using certs that are set up during agent registration. Added
instruction on machines page how to install an agent. Added UI for
presenting and regenerating server token.

- fixed creating containers in the tests
- improved building rpm/deb packages that they
  are writted as current user (not as root as before);
  this improves also caching tools and packages for building
  in containers

- demo deploy only happens when merge is made to master
  or on manual request
- pipelines are not triggered on tag
- fixed demo shutting down

- fixed invoking packaging command in .gitlab-ci.yml
- hardened running wget in Rakefile
- added shell test for packages

Added support and scripts for deploying stork to stork.lab.isc.org
automatically from gitlab pipelines.

This is to investigate if the build steps involoving nodejs will speed up.
Otherwise, the build hangs on trying to download nodejs using IPv6 and
wait for a timeout.

Ported the fix already present in other tickets whereby the IPv6 is
disabled in Gitlab CI because it causes connectivity issues. Also,
removed the hack with echoing gitlab host to /etc/hosts as it is not
required and is prone to gitlab IP address changes.

- removed not working parts from ui
- fixed getting version
- fixed empty tab name
- added rake target for building tarball

Added wrapping to backend unittest task in rakefile that starts container with pgsql.
Switched to gitlab local container images to speed up and make more reliable starting
containers.

- server connects to agents using gRPC
- added defining commandline arguments to agent and server
- improved CI, switched to our own docker image for gitlab ci pipelines