Resolve "Fix behave test using openappstack test option"

Closes #461 and #463

See merge request openappstack/openappstack!201

Resolve "Update help for create command"

Closes #466

See merge request openappstack/openappstack!206

Apparently firefox geckodriver renders the grafana home page in a different
order than chromedriver. So we wait for an element which gets rendered at the
very end.

Closes: #463

Closes: #466

Resolve "Update hardware requirements"

Closes #471

See merge request openappstack/openappstack!205

Resolve "Use gitlab instance as source for flux"

Closes #448

See merge request openappstack/openappstack!204

Closes: #471

Resolve "Integration of single sign-on into oas"

Closes #439

See merge request openappstack/openappstack!183

Resolve "Create custom perststant volume for nextcloud and onlyoffice"

Closes #434

See merge request openappstack/openappstack!181

Resolve "Freeze all dependencies versions for beta test"

Closes #451

See merge request openappstack/openappstack!197

Resolve "Update install instructions"

Closes #312

See merge request openappstack/openappstack!195

change cert-manager namespace to oas namespace

See merge request openappstack/openappstack!200

Resolve "Include command line tests in testing instructions"

Closes #455

See merge request openappstack/openappstack!196

Resolve "Make rocketchat test deployment"

Closes #166

See merge request openappstack/openappstack!166

Closes: #451