Python/Pexpect: Fix winpexpect stub when not in default sys.path
Python/Pexpect: Fix winpexpect stub when not in default sys.path

WinPexpect uses a stub process to launch the child process with a clean
set of handles but needs to "import winpexpect" in the stub.  Teach the
stub to put the winpexpect location in sys.path before importing it in
case it is not there by default.

Change-Id: I6c770185f8bef9d3d4b695139ee710f6592c2f1c

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