[jds-review] python pty leak fix and dtrace support patches

[Laszlo (Laca) Peter]

Adding 2 new patches.  One is upstream:
https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1648435&group_id=5470
the other one adds dtrace support.  Both were written by John Levon.

Laca

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