[Buildbot] #2916: p4 tests fail on windows

[Buildbot trac]

#2916: p4 tests fail on windows
-------------------+-----------------------------
Reporter:  dustin  |      Owner:  dustin
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  0.9.0
 Version:  0.8.9   |   Keywords:  simple, windows
-------------------+-----------------------------
 {{{
   'initial_stdin': 'Client: p4_client1\n\nOwner:
 user\n\nDescription:\n\tCreated by
 user\n\nRoot:\tC:\\Users\\username\\Workspace\\wkdir\n\nOptions:\tallwrite
 rmdir\n\nLineEnd:\tlocal\n\nView:\n\t//depot/trunk/...
 //p4_client1/...\n',
 }}}
 vs. the expected
 {{{
   'initial_stdin': 'Client: p4_client1\n\nOwner:
 user\n\nDescription:\n\tCreated by
 user\n\nRoot:\tC:\\Users\\username\\Workspace/wkdir\n\nOptions:\tallwrite
 rmdir\n\nLineEnd:\tlocal\n\nView:\n\t//depot/trunk/...
 //p4_client1/...\n',
 }}}

 in particular, the wkdir is joined using the OS-specific path separator,
 `\` on windows.

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Ticket URL: <http://trac.buildbot.net/ticket/2916>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation