Revert "Fix some easy things in test_lzma.py for Python 2"
Revert "Fix some easy things in test_lzma.py for Python 2"

This reverts commit e98a7b703e1c2e19ddb42b04c1dbd944816c8d99.

The Python 3 module test.support is available under the namespace
test.test_support on Python 2. Thanks to Nadeem Vawda for this tip.

peterjc/backports.lzma,r3m0t/backports.lzma,peterjc/backports.lzma