tests: cleanup of tests that got lost in their own nested directories Some tests ended up in a directory several directories deeper than $TESTTMP, usually because some 'cd ..' had been forgotten between different test cases. Add 'cd ..' where they are missing so the tests get back where they started.

tests: cleanup of tests that ended up outside $TESTTMP No harm done, but it might confuse later on.

tests: remove 'hghave symlink' from test-import-git.t The test had a long chain of commits depending on execbits in some of first commits. The hashes are checked throughout the file, so there was no elegant way to make it pass both with and without execbits. We now rollback the execbits-or-not commits and make a stable change instead. The hash chain is thus updated once but is now a bit more stable. The test coverage should be unaltered.