lxc: make python support optional and disabled by default

We don't have any use for it right now and it currently breaks our builds:

| make[3]: Entering directory
`/home/jenkins/workspace/luneos-stable/webos-ports/tmp-glibc/work/armv7a-vfp-neon-webos-linux-gnueabi/lxc/1.0.1-r0/build/src/python-lxc'
| CFLAGS="-O2 -pipe -g -feliminate-unused-debug-types -Wall -Werror -I ../../src
-L../../src/lxc/" /usr/bin/python3 setup.py build
| /usr/bin/python3: can't open file 'setup.py': [Errno 2] No such file or directory

Signed-off-by: Simon Busch <morphis@gravedo.de>
org.webosports.app.firstuse=6

submissions/5..submissions/6
0eec3f9 Correctly implement locale/country selection

Signed-off-by: Simon Busch <morphis@gravedo.de>
luna-appmanager=19

submissions/18..submissions/19
2b2ab4f Don't exit when locale has changed

Signed-off-by: Simon Busch <morphis@gravedo.de>