[lit] Actually run tests for internal env command

Put the main test script in the right directory, and fix a python bug
in a local script.

Reviewed By: stella.stamenova

Differential Revision: https://reviews.llvm.org/D65623

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367751 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/tests/Inputs/shtest-env/print_environment.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from __future__ import print_statement
+from __future__ import print_function
 import os
 
 sorted_environment = sorted(os.environ.items())