system/essential/verbatim-files: NetworkManager/dispatcher.d/99-dnsmasq: (temporarily) ditch.

Seems like openresolv (/usr/bin/resolvconf) does exactly what this hack is
intended to do, and it integrates into DHCP clients themselves.

Next commit will add openresolv <-> dhclient interoperation.
system/essential/verbatim-files: dhclient-enter-hooks: make dhclient resolvconf-aware.
system/essential/verbatim-toplevel: netctl/interfaces/wlan0: move to dhclient.

Now that it is resolvconf-aware and does not mess with /etc/resolv.conf anymore,
switch to it as it is more resilient to (apparently) misconfigured DHCP servers
found in public WLAN access points.
system/essential/verbatim-toplevel: netctl: update WLAN profiles.