Apparently, even if you don't select the `openvswitch-python` package,
Python still gets built (for the target build).
But, if the python dependencies are conditional on the
`PACKAGE_openvswitch-python` symbol then they aren't build.
This should improve build times, if you only want to build the
`openvswitch` package.
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>