Python Experimental: code will still run after stop debugging

[kzhui125]

Environment data

• VS Code version: 1.22.1
• Extension version (available under the Extensions sidebar): 2018.3.1
• OS and version: Win10
• Python version: 3.6 64bit

Actual behavior

print 1 2 3

Expected behavior

print 1

[DonJayamanne]

Upstream (regression) microsoft/ptvsd#325