Add Delete user API by username to be called by the auth service

[corinnekrych]

• Please describe what your change is about. Fixes https://openshift.io/openshiftio/Openshift_io/plan/detail/1154

[sbose78]

Let's have this service called by the Auth service, since the Auth service is the source of truth for any user information.

[corinnekrych]

@sbose78 ok, I've rolled back to use auth-service instead of admin-console. Good to go?

[codecov[bot]]

Codecov Report

Merging #2386 into master will decrease coverage by 0.06%. The diff coverage is 55.46%.

@@            Coverage Diff             @@
##           master    #2386      +/-   ##
==========================================
- Coverage   67.82%   67.75%   -0.07%     
==========================================
  Files         183      183              
  Lines       17994    18122     +128     
==========================================
+ Hits        12204    12279      +75     
- Misses       4616     4661      +45     
- Partials     1174     1182       +8

Impacted Files	Coverage Δ
migration/migration.go	78.01% <100%> (+0.07%)	:arrow_up:
account/user.go	50% <43.9%> (-3.09%)	:arrow_down:
controller/users.go	70% <54.68%> (-3.99%)	:arrow_down:
space/space.go	70.25% <77.27%> (+0.6%)	:arrow_up:
workitem/workitem_revision_repository.go	86.2% <0%> (-6.9%)	:arrow_down:
workitem/workitem_repository.go	68.7% <0%> (+0.67%)	:arrow_up:

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[corinnekrych]

@sbose78 @kwk with d2c983d addresses the issue for:

• when removing a user we keep all her contribution on spaces he doesn't owned
• when removing a user we delete all spaces (and associated data) he owned.

[corinnekrych]

[test]

[corinnekrych]

[test]

[corinnekrych]

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