Red Hat and CentOS Linux: Use PEERNTP=no to ignore any NTP server info provided by DHCP

Any NTP server information provided by DHCP can be ignored by setting PEERNTP=no anywhere in the sourced network scripts (e.g. /etc/sysconfig/network). This is useful in situations where a specific NTP setup is required rather than a default configuration supplied via DHCP. 

https://bugzilla.redhat.com/show_bug.cgi?id=809367