[MERGE] harmonize run_bzr_subprocess with run_bzr

[Aaron Bentley]

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Hi all,

When we were changing the calling conventions for run_bzr, we somehow
forgot to update run_bzr_subprocess to match.  This patch updates
run_bzr_subprocess to use the same calling conventions as run_bzr.

I also did a drive-by import cleanup in test_debug, which had no reason
to import the subprocess module.

Aaron
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