selftest on win32

[Mark Hammond]

> If you want to talk about
> particular messages, post them here (or refer to older threads.)

A fair bit of noise (55 failures at last count) are along the lines of:

"""
FAIL: test_push_only_pushes_history
(bzrlib.tests.blackbox.test_push.TestPush)
vvvv[log from
bzrlib.tests.blackbox.test_push.TestPush.test_push_only_pushes_history]
...
LockContention: Could not acquire lock
"O:/window~1/testbzr-ds0uvn.tmp/.test_push_only_pushes_history/work/push-b/.
bzr/checkout/dirstate"
"""

Mark