tests/test-issue842.t

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.

http://mercurial.selenic.com/bts/issue842

  $ hg init
  $ echo foo > a
  $ hg ci -Ama
  adding a

  $ hg up -r0000
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo bar > a

Should issue new head warning:

  $ hg ci -Amb
  adding a
  created new head

  $ hg up -r0000
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo stuffy > a

Should not issue new head warning:

  $ hg ci -q -Amc

  $ hg up -r0000
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo crap > a
  $ hg branch testing
  marked working directory as branch testing
  (branches are permanent and global, did you want a bookmark?)

Should not issue warning:

  $ hg ci -q -Amd