swift-init: Don't expose misleading commands
swift-init: Don't expose misleading commands

The kill_child_pids command does NOT need to be an @command to be
available in probe tests.  I don't think it's helpful to operators,
since restarting all children is best handled by existing
reload/seamless-reload commands.  But mainly the seamless option is
misleading since it very much results in a NOT seamless reload (all
workers close sockets immediately, and nothing can accept new
connections until existing connections finish and the parent spawns
replacement workers - i.e. it's just like graceful)

Change-Id: Ic4b274da7dcf9b166513d9c138f4b0370b01eeb0

tipabu/swift,openstack/swift,openstack/swift,swiftstack/swift,openstack/swift,tipabu/swift,openstack/swift,swiftstack/swift,swiftstack/swift,tipabu/swift,tipabu/swift