Require python 2.7.

We were already requiring 2.5, which meant that people on old linux distros
had to upgrade anyway.

Requiring python 2.6 will make supporting 3.X easier as we can use the 3.X
exception syntax.

According to the discussion on llvmdev, there is not much value is requiring
just 2.6, we may as well just require 2.7.

git-svn-id: http://llvm.org/svn/llvm-project/llvm/trunk/utils/lit@224129 91177308-0d34-0410-b5e6-96231b3b80d8
Now that we require a newer python, use the new exception syntax.

git-svn-id: http://llvm.org/svn/llvm-project/llvm/trunk/utils/lit@224130 91177308-0d34-0410-b5e6-96231b3b80d8