[Shell] Simplify Extracting Python Version

Instead of parsing the Python version with a fairly convoluted regex,
just print the major and minor version and call it a day.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@358635 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed