Fix pip download VCS scp-like URLs

[atugushev]

For example: git+user@hostname:user/repo.git
Fixes #6293.

[atugushev]

Huh, for integrational tests there has to be deploy key with RO access to https://github.com/pypa/pip-test-package. Can someone help me to deal with it?

Command "git clone -q [email protected]:pypa/pip-test-package.git /tmp/pytest-of-travis/pytest-0/popen-gw1/test_download_vcs_scp_like_url0/workspace/tmp/pip-req-build-oX40kZ" failed with error code 128 in None
-- stdout: --------------------
Collecting [email protected]:pypa/pip-test-package.git
  Cloning [email protected]:pypa/pip-test-package.git to /tmp/pytest-of-travis/pytest-0/popen-gw1/test_download_vcs_scp_like_url0/workspace/tmp/pip-req-build-oX40kZ
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

[pradyunsg]

Seems like something intermittent. Closed and opened to retrigger the tests.

[atugushev]

@pradyunsg thank you. But, the thing is i've added an integrational test which installs a test package from another github repository [email protected]:pypa/pip-test-package.git over SSH (git+git@..., which is git+ssh://) and it wants a deploy key now. Locally tests are fine, for i have the github's user ssh-key.

Anyways, it seems members are considering to drop support scp-like URLS in the related issue. May be it's not worth to spend a time on it.

[pradyunsg]

I don't have the bandwidth to review right now. Sorry!

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