Bug 991450 - Add wifi testing config files and services. r=vicamo

1) Copy template wpa_supplicant.conf to system/etc/wifi.
2) Add wifi related services to init.goldfish.rc.patch.
3) Hoist init.goldfish.rc.patch since it's no longer BT only.
Bug 991450 (follow-up) - Add a default goldfish AP by running a hostapd.