overlay-files: Refactor wlan0 ifup Networking Configuration (#998)

general/overlay/etc/network/interfaces.d/wlan0

@@ -1,5 +1,6 @@
+auto wlan0
 iface wlan0 inet dhcp
-    post-up wpa_passphrase "$(fw_printenv -n wlanssid || echo OpenIPC)" "$(fw_printenv -n wlanpass || echo OpenIPC12345)" > /tmp/wpa_supplicant.conf
-    post-up sed -i '2i \\tscan_ssid=1' /tmp/wpa_supplicant.conf
-    post-up wpa_supplicant -B -i wlan0 -D nl80211,wext -c /tmp/wpa_supplicant.conf
+    pre-up wpa_passphrase "$(fw_printenv -n wlanssid || echo OpenIPC)" "$(fw_printenv -n wlanpass || echo OpenIPC12345)" > /tmp/wpa_supplicant.conf
+    pre-up sed -i '2i \\tscan_ssid=1' /tmp/wpa_supplicant.conf
+    pre-up wpa_supplicant -D nl80211,wext -i wlan0 -c /tmp/wpa_supplicant.conf -B
     post-down killall -q wpa_supplicant

general/overlay/etc/wireless/interfaces/wlan0

@@ -1,6 +1,6 @@
 auto wlan0
 iface wlan0 inet dhcp
-    post-up wpa_passphrase "$(fw_printenv -n wlanssid || echo OpenIPC)" "$(fw_printenv -n wlanpass || echo OpenIPC12345)" > /tmp/wpa_supplicant.conf
-    post-up sed -i '2i \\tscan_ssid=1' /tmp/wpa_supplicant.conf
-    post-up wpa_supplicant -B -i wlan0 -D nl80211,wext -c /tmp/wpa_supplicant.conf
+    pre-up wpa_passphrase "$(fw_printenv -n wlanssid || echo OpenIPC)" "$(fw_printenv -n wlanpass || echo OpenIPC12345)" > /tmp/wpa_supplicant.conf
+    pre-up sed -i '2i \\tscan_ssid=1' /tmp/wpa_supplicant.conf
+    pre-up wpa_supplicant -D nl80211,wext -i wlan0 -c /tmp/wpa_supplicant.conf -B
     post-down killall -q wpa_supplicant

general/package/busybox/busybox.config

@@ -995,7 +995,7 @@ CONFIG_UDHCP_DEBUG=0
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
 CONFIG_FEATURE_UDHCP_RFC3397=y
 CONFIG_FEATURE_UDHCP_8021Q=y
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-x hostname:$(hostname) -T 1 -t 5 -R -b -O search"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-x hostname:$(hostname) -T 1 -t 15 -R -b -O search"
 
 #
 # Print Utilities