system/essential: rip out hand-made infrastructure for pm-utils.

It is replaced by self-written systemd-aware mechanism which is to be installed
separately as a proper package.
system/essential/verbatim-toplevel: netctl, router: move self-hosted WLAN network definition to embedded configsection.

Unless Frequency= is added to netctl.profile, it will remain a configsection.
system/essential/verbatim-toplevel: netctl: update profiles.