portability fix for test-ssh The __del__ method of sshrepo reads the stderr of the remote process until EOF and prints it. If an exception is raised, this method ends up being called: - on Linux: after the "abort: ..." message is printed - on OS X: before the "abort: ..." message is printed This patch explicitly flushes the stderr of the remote process before raising a RepoError.

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
merge: warning: conflicts during merge
merging a
merging a failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
There are unresolved merges, you can redo the full merge using:
  hg update -C 2
  hg merge 1
e7fe8eb3e180+0d24b7662d3e+ tip
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