ssh: unban the use of pipe character in user@host:port string This vulnerability was fixed by the previous patch and there were more ways to exploit than using '|shellcmd'. So it doesn't make sense to reject only pipe character. Test cases are updated to actually try to exploit the bug. As the SSH bridge of git/svn subrepos are not managed by our code, the tests for non-hg subrepos are just removed. This may be folded into the original patches.

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