Add NOFILE and NPROC ulimit settings to the OpenRC init script

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Add NOFILE and NPROC ulimit settings to the SysV init script

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #6814 from tianon/more-init-ulimit

Add NOFILE and NPROC ulimit settings to OpenRC and SysVinit