Fixed use of rpm tools

rpm has removed the db related options --initdb and --rebuilddb
from the master rpm command. They are only available in the rpmdb
command. Thus kiwi should better search for the rpm tool chain
and decide for the commands to use according to their existence
Update 13.2 JeOS template

added default network setup on lan0
Update 13.2 JeOS description

added less and iproute2 packages by default