Startup script enhancements.

- Add a work-around for audio issues in older Raspberry firmware.
  raspberrypi/linux#570

- Move a few things around to give DHCP a little more time to come
  up before we log/announce the IP addresses.  This way we're doing
  something rather than just waiting in WaitForDHCPIPs for the IP(s)
  to come up.

- Disable wifi interface by default on stock SD image so that
  WaitForDHCPIPs doesn't wait 60 seconds for it to get an IP address.
  When users configure wifi via the Network Config screen, we'll
  detect that and wait for an IP to come up on the wireless interface.

- Execute flite in the background so that we can proceed with bootup
  while it announces our IP addresses.  Shaves another few seconds off
  our boot time.

scripts/startup

@@ -22,33 +22,54 @@ cp ${FPPDIR}/etc/php.ini /etc/php5/apache2/php.ini
 # If the flash drive is not mounted yet, then fix Apache so it can at least start up
 if [ ! -d "/home/pi/media/logs" ]
 then
-	perl -pi -e "s/ErrorLog.*/ErrorLog \/var\/tmp\/apache-error.log/" /etc/apache2/sites-available/default
+	sed -i "s/ErrorLog/#ErrorLog/" /etc/apache2/sites-available/default
 	/etc/rc2.d/S02apache2 restart
 fi
 
 # Configure Network and DNS
 ${BINDIR}/config_network
 ${BINDIR}/config_dns
 
-WaitForDHCPIPs
+###########################################################################
+# Part #1 of workaround for https://github.com/raspberrypi/linux/issues/570
+# Play some silence while we set the volume so the new value will stick
+mpg123 /opt/fpp/media/silence.mp3 > /dev/null 2>&1 &
+SILENCEPID=$!
+###########################################################################
 
 amixer cset numid=3 1
 ORIGVOLUME=$(getSetting volume)
+# Switch to this more accurate setting for or after v0.3.0
+#VOLUME=$(echo "scale=2 ; ${ORIGVOLUME} / 2 + 50" | bc)
 VOLUME=$(expr ${ORIGVOLUME} / 2 + 50)
 amixer set PCM ${VOLUME}%
 
+###########################################################################
+# Part #2 of workaround for https://github.com/raspberrypi/linux/issues/570
+sleep 1
+kill -9 ${SILENCEPID}
+###########################################################################
+
 # Let's check that our .asoundrc is as valid as we care about right now
 if [ ! -e /proc/asound/card$(sed -n '/card [0-9]*/p' /root/.asoundrc | head -n 1 | awk '{print $2}') ]; then
 	echo "Configured sound card might not exist, let's set it to 0 as a default."
 	sed -i 's/card [0-9]/card 0/' /root/.asoundrc
 fi
 
+sysctl net/ipv4/igmp_max_memberships=150
+/usr/local/bin/gpio load spi 100
+
+${BINDIR}/piRTC
+
+# Make sure our DHCP IPs are up before we log/announce them.
+WaitForDHCPIPs
+
 # Print/Say the IP address
 _IP=$(hostname -I) || true
 if [ "$_IP" ]; then
   printf "My IP address is %s\n" "$_IP"
   arrHost=(${_IP// / })
-  flite -voice kal "I Have Found The Following I P Addresses, ${arrHost[0]}, ${arrHost[1]},  ${arrHost[2]}"
+  flite -voice kal "I Have Found The Following I P Addresses, ${arrHost[0]}, ${arrHost[1]},  ${arrHost[2]}" &
 fi
 
 # Check for flash drive mounted
@@ -76,16 +97,9 @@ else
 fi
 done
 
-sysctl net/ipv4/igmp_max_memberships=150
-/usr/local/bin/gpio load spi 100
-
-# mpg123 ${FPPDIR}/bin/silence.mp3 > /dev/null
-
 sed -e "s#FPPDIR#${FPPDIR}#g" < ${FPPDIR}/etc/apache2.site > /etc/apache2/sites-available/default
 /etc/rc2.d/S02apache2 restart
 
-${BINDIR}/piRTC
-
 ${BINDIR}/fpp_boot
 
 PiLCDenabled=$(awk -f ${FPPDIR}/scripts/readSetting.awk /home/pi/media/settings setting=PI_LCD_Enabled)
@@ -110,7 +124,7 @@ else
 	setterm -blank 0
 fi
 
-# Sleep for just a little while so the use can see the login prompt before
+# Sleep for just a little while so the user can see the login prompt before
 # we display the logo
 (sleep 60 ; /usr/bin/fbi -T 1 -noverbose -a /etc/splash.png) &