Kill background fetch when it requests a passphrase

[stefanhaller]

Previously we would enter a newline at the password prompt, which would cause the fetch to fail. The problem with this was that if you have many remotes, the fetch would sometimes hang for some reason; I don't totally understand how that happened, but I guess the many ssh processes requesting passwords would somehow interfere with each other. Avoid this by simply killing the git fetch process the moment it requests the first password.

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for da32b591	✅ 63.64%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (da32b59)	Report Missing	Report Missing	Report Missing
Head commit (1bb6ee0)	56459	49022	86.83%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4588)	22	14	63.64%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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