Setting tag bootmanager-6.0-0

Setting tag bootmanager-6.0-0
* this is STILL BASED ON PYTHON2, but relies on 2 accessory libraries that are pypcilib and pyplnet
for this reason, the relevant files are COPIED at packaging time
* new settings lxc_ROOT_SIZE=12G (was 70G) and SWAP_SIZE=4G (was 1G)
and lxc_TOTAL_MINIMUM_DISK_SIZE=50 (was 120)
* invoke conf_files.py as a plain script (i.e. expects a shebang) since we ideally can still
use this code against a python2 nodemanager
* skip nodeupdate step, will be redone later anyway
* rely on NetworkManager utilities when ifconfig can't be found
* tear down patch for very old 2.6.12 kernels
* a little closer to python3 though