wpa_supplicant does not create pidfile

[Dominic Fandrey]

wpa_supplicant doesn't create the pidfile if the target directory
does not exist. Because /var/run is wiped with every boot I added
the following line to my rc.local to workaround this issue:

/bin/mkdir -p /var/run/wpa_supplicant

I'm running RELENG_8.

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