maintainers: Change maintainers for python(3) modules

maintainers: Change maintainers for python(3) modules

Some packages with recipes for both python2 and python3
must be upgraded simultaneously to avoid version conflicts
due to common dependencies.
This change distributes responsibilities to provide
a single maintainer for related recipes.

Signed-off-by: Jose Lamego <jose.a.lamego@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>