Add git-obs init command

[andrii-suse]

No description provided.

[dmach]

I've completed the first review, I suppose I'll have more questions later.
We definitely need to clarify the overall design, it doesn't seem to be complete to me.

[dmach]

This duplicates get_login().
Couldn't we simplify it?

[andrii-suse]

The only "duplicate" part is a loop over login entries and I don't think about any simplification that can replace a simple loop. E.g. adding an abstraction function with a callback instead of simple loop is not much simpler.

[codecov]

Codecov Report

❌ Patch coverage is 14.53488% with 147 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.15%. Comparing base (06bc3f2) to head (527cef9).
⚠️ Report is 87 commits behind head on master.

Files with missing lines	Patch %	Lines
osc/commands_git/repo_init.py	0.00%	62 Missing ⚠️
osc/git_scm/store.py	35.41%	31 Missing ⚠️
osc/util/file_utils.py	0.00%	23 Missing ⚠️
osc/gitea_api/conf.py	4.54%	21 Missing ⚠️
osc/gitea_api/repo.py	0.00%	7 Missing ⚠️
osc/gitea_api/git.py	70.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1864      +/-   ##
==========================================
- Coverage   34.53%   34.15%   -0.39%     
==========================================
  Files         167      173       +6     
  Lines       23343    24054     +711     
==========================================
+ Hits         8062     8216     +154     
- Misses      15281    15838     +557     

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[dmach]

I've force-pushed rebased PR with conflicts resolved.
The tests are still failing, because the used git repos are not valid Git SCM checkouts.
We either need to set apiurl, project and package or change how git-obs repo init interacts with the underlying git.
I'll look into that.