waf: disable-python - fix ctdb configuration

waf: disable-python - fix ctdb configuration

When ctdb is built in standalone mode, it turned off the python
requirement for submodules by setting Options.options.disable_python
to True before checking for its own (non-optional) python support.

Ad ctdb does not need python for itself or any of the submodules
it is built against, the safest solution seems to be to allow
the python and python-headers checks to not find python.

Signed-off-by: Ian Stakenvicius <axs@gentoo.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>