Get Netrc machine from clone url (#800)

[6543]

Backport #800

We previously got the machine hostname for Netrc from the url of the remote, but in cases where the clone-url does not match the api url this can lead to errors.

[codecov-commenter]

Codecov Report

Merging #803 (6b5a187) into release/v0.15 (7a4c6d3) will decrease coverage by 0.42%.
The diff coverage is 35.71%.

@@                Coverage Diff                @@
##           release/v0.15     #803      +/-   ##
=================================================
- Coverage          52.14%   51.71%   -0.43%     
=================================================
  Files                 86       88       +2     
  Lines               5953     5996      +43     
=================================================
- Hits                3104     3101       -3     
- Misses              2676     2717      +41     
- Partials             173      178       +5     

Impacted Files	Coverage Δ
server/remote/bitbucketserver/bitbucketserver.go	0.00% <0.00%> (ø)
server/remote/gitlab/gitlab.go	27.36% <0.00%> (+0.34%)	⬆️
server/remote/common/utils.go	38.46% <38.46%> (ø)
server/remote/gitea/gitea.go	38.33% <40.00%> (-0.38%)	⬇️
server/remote/github/github.go	16.29% <40.00%> (-2.00%)	⬇️
server/remote/coding/coding.go	65.38% <50.00%> (-0.96%)	⬇️
server/remote/gogs/gogs.go	60.91% <50.00%> (-1.07%)	⬇️
server/remote/common/status.go	0.00% <0.00%> (ø)

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