Use WebSocket to get global settings

[maciaszczykm]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #1903.

Special notes for your reviewer:

• serve crashes on websocket close angular/angular-cli#11156 is a known bug that will crash the app if it is served locally and the connection will be rejected/canceled by the server.
• changeOrigin: true in our proxy configurations doesn't change the Origin header but Host (Update options.changeOrigin description in docs chimurai/http-proxy-middleware#141). Backend is checking for the Origin header as it does not allow cross-origin requests. It will not be a problem as both UI and API will be normally served on the same host, but it was a problem for our development setup. headers: {'Origin': 'https://dev.kubermatic.io'} solves that problem as the proxy will override the Origin header too. I am leaving it there as it was extremely hard to find it as Angular CLI uses webpack-dev-server which uses http-middleware-proxy and each one of them has different configuration which are not documented.

Release note:

Use WebSocket to get global settings.

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maciaszczykm

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[codecov]

Codecov Report

Merging #2008 into master will increase coverage by 0.12%.
The diff coverage is 52.38%.

@@            Coverage Diff             @@
##           master    #2008      +/-   ##
==========================================
+ Coverage   68.67%   68.79%   +0.12%     
==========================================
  Files         248      248              
  Lines        9168     9169       +1     
  Branches     1170     1169       -1     
==========================================
+ Hits         6296     6308      +12     
+ Misses       2866     2855      -11     
  Partials        6        6

Impacted Files	Coverage Δ
src/environments/environment.ts	100% <ø> (ø)	⬆️
src/app/settings/admin/admin-settings.component.ts	41.93% <0%> (-0.69%)	⬇️
src/app/wizard/wizard.component.ts	48.53% <100%> (ø)	⬆️
src/app/core/services/settings/settings.service.ts	64.93% <90%> (+12.37%)	⬆️
src/app/kubermatic.component.ts	65.75% <0%> (+2.73%)	⬆️
src/app/core/components/footer/footer.component.ts	92.3% <0%> (+7.69%)	⬆️

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[maciaszczykm]

/assign @floreks

[kubermatic-bot]

@maciaszczykm: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-dashboard-e2e	d6d0fae	link	/test pull-dashboard-e2e

Full PR test history

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[maciaszczykm]

/retest

[maciaszczykm]

@floreks Please take another look, it seems that I have fixed existing problems already. Please also test it, there is no hurry with it and I'd like to be sure that nothing breaks.

/assign @kgroschoff

Please verify it too if you can.

[floreks]

/lgtm

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 158872838ad4a357f4a3ff886f8cd4bc24df1889