Add i386 and ppc64 standalone Python support
Add python_bin_url entries for i386 and ppc64 architectures and normalize i*86 variants (i486, i586, i686) to i386 so guests on 32-bit x86 pick up the correct standalone Python runtime.
Add python_bin_url entries for i386 and ppc64 architectures and normalize i*86 variants (i486, i586, i686) to i386 so guests on 32-bit x86 pick up the correct standalone Python runtime.