Add named-chroot support to ISPConfig
I'am currently setting up named with chroot on CentOS 7 and it happened to me that ISPConfig couldn't deploy modified or new zones after the switch to chrooted named. The reason for this problem seems to be that the systemd service file on CentOS for chrooted named isn't "named" as it is everywhere hardcoded in the ISPConfig code.
On CentOS it would be "named-chroot.service" so for the sake of simplicity I think it might be better if everyone could modify the service name over the ISPConfig backend, similar to the init file boxes of additional PHP versions.