support for ubuntu 14.04 for p8le
fix defect #4180 [DEV](xcatconfig -i) complains (Command failed: find /usr/share/zoneinfo -type f -exec cmp -s /etc/localtime {} \; -print | grep -v posix | grep -v SystemV 2>&1. Error message: .) on ubuntu14.04
support set 'x%' for option '-l rootlimitsize' of genimage