Provide a feature for administrators to enable which decreases cPanel services OOM susceptibility

It may be useful for some administrators that do not configure overcommit and OOM Killer features in Linux, to have such a setting for cPanel which could provide some form of granular control over some services (such as cpsrvd/backups/tailwatchd). For instance, if they consider such services to be important enough to prioritize, the new interface could utilize oom_adjust for selected services to prevent them being killed if their overcommit setting allowed.

https://www.kernel.org/doc/Documentation/filesystems/proc.txt (See: 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj- Adjust the oom-killer score)

http://blog.fpmurphy.com/2014/12/out-of-memory-killer.html#sthash.6cCtPtGG.dpbs

https://lwn.net/Articles/317814/