Merging r361114:

------------------------------------------------------------------------
r361114 | mgorny | 2019-05-18 23:05:31 -0700 (Sat, 18 May 2019) | 3 lines

[lldb] [lit] Driver/TestConvenienceVariables.test requires Python

Differential Revision: https://reviews.llvm.org/D62096
------------------------------------------------------------------------

llvm-svn: 364257