NOTE:
-----
As of version 6.0 dhcpcd includes a hook, 10-wpa_supplicant, that starts
wpa_supplicant for wireless interfaces. The hook expects that the default
configuration file of wpa_supplicant is /etc/wpa_supplicant.conf.
Unfortunately our port is using /etc/wpa.conf as the default. I've
changed that with the current commit to /etc/wpa_supplicant. To keep
your current configuration a symlink to wpa.conf is installed as well
for now, but might be removed in future versions of the port.
It's possible to define the configuration name with a
wpa_supplicant_conf=/etc/wpa.conf
in
/etc/dhcpcd/dhcpcd.enter-hook
but using the default name is preferable.
Sorry for the inconvenience.