Debuggers breaks into PTVSD code

[DonJayamanne]

• Create a python file with the following code:

if True:

• Enable the setting [x] Uncaught Exceptions
• Debug using the experimental debugger
• Debugger breaks into pydevd code

I've been told in the past this is related to #194, however I disagree.
This is related to #169, i.e. we shouldn't be stepping/breaking into the debugger code.
Note: This is not standard lib code, its pydevd (debugger code).

[DonJayamanne]

@int19h @karthiknadig cc

[karthiknadig]

That is breaking into runpy.py, That is standard library file, give that it is located in the python install directory.

[DonJayamanne]

Oops, yes, for some reason I thought I saw pydevd. Sorry.