Provide a -j option that can take a jail name or id. If -j is specified,
check that the jail exists and proxy the service request through to
service(8) in the jail.
This allows for cleaner workflows when updating services in a jail, turning
the following:
pkg -j dns upgrade
jexec dns service named restart
into:
pkg -j dns upgrade
service -j dns named restart
PR: 223325
Submitted by: David O'Rourke (with slight changes)
MFC after: 2 weeks
Its primary purpose is to start and stop services provided by
the rc.d scripts, however it can also be used to list the scripts
using various criteria.