setup: override 'build_ext' / 'build_py' commands rather than 'build'

We override the 'build' command to invoke the code generator before the
extensions are compiled. The 'build' command, however, is merely a
wrapper around several other commands. It is possible for the user to
directly invoke those commands, in which case our code generator won't
get a chance to run:

$ python setup.py build_ext
running build_ext
building 'libvirtmod' extension
creating build/temp.linux-x86_64-3.10
creating build/temp.linux-x86_64-3.10/build
gcc ..snip... -c build/libvirt.c -o build/temp.linux-x86_64-3.10/build/libvirt.o
cc1: fatal error: build/libvirt.c: No such file or directory
compilation terminated.
error: command '/usr/lib64/ccache/gcc' failed with exit code 1

To solve this we instead override 'build_ext' and 'build_py'. This in
turn means we call the generator to emit C code separately from Python
code.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

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