tests/test-rebase-keep-branch.out

run-tests.py: avoid using popen2.Popen4 - use subprocess instead

Use subprocess to emulate Popen4 if available - similar to how it is done in
util.py.

Using popen2 under python 2.6 gives
DeprecationWarning: The popen2 module is deprecated.  Use the subprocess module.

0 files updated, 0 files merged, 2 files removed, 0 files unresolved
marked working directory as branch notdefault
created new head
@  4:r1:notdefault
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o  1:c2:
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o  0:c1:


% Rebase a branch while preserving the branch name
2 files updated, 0 files merged, 1 files removed, 0 files unresolved
saving bundle to 
adding branch
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
rebase completed
@  4:r1:notdefault
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o  3:l2:
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o  2:l1:
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o  1:c2:
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o  0:c1: