fix defect #4189 [DEV] ubuntu14.04-x86_64-netboot-compute provision complains (/tmp/updateflag: line 4: nc: command not found) and defect #4188 [DEV]2 warning message during genimage ubuntu14.04-x86_64-netboot-compute
fix defect #4190 [DEV]apache2 configuration file /etc/apache2/conf-enabled/xcat.conf.apach24 failed to be applied on ubuntu14.04 MN
fix defect #4190 [DEV]apache2 configuration file /etc/apache2/conf-enabled/xcat.conf.apach24 failed to be applied on ubuntu14.04 MN