[lit] Make the 'llvm-lit' utility defend against a system where Python3 is the default.
[lit] Make the 'llvm-lit' utility defend against a system where Python3
is the default.

The lit.cfg files are not all valid Python3 and I've no idea if anyone
is really prepared to update them. The easiest way I know of to ensure
that this script uses Python 2 is to use 'python2.7' in the command. Mac
and Linux are definitely fine with this and I think other platforms will
be as well, but if anyone struggles with this set up and has better
ideas, let me know.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@229244 91177308-0d34-0410-b5e6-96231b3b80d8

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