image.bbclass/initscripts: Make /etc/timestamp usage consistent.

Timestamp is kept in UTC
 Remove superfluous 'create_etc_timestamp()' function
 - seems to be a duplicate of 'rootfs_update_timestamp()'
 Remove External function reference

[sgw@linux.intel.com: merged 2 patches and cleanup commit message]

Signed-off-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh

@@ -65,13 +65,13 @@ fi
 # If the timestamp is 1 day or more recent than the current time,
 # use the timestamp instead.
 /etc/init.d/hwclock.sh start
-if test -e /etc/timestamp2
+if test -e /etc/timestamp
 then
-	SYSTEMDATE=`date "+%Y%m%d%2H%2M"`
-	read TIMESTAMP < /etc/timestamp2
+	SYSTEMDATE=`date  -u +%2m%2d%2H%2M%4Y`
+	read TIMESTAMP < /etc/timestamp
         NEEDUPDATE=`expr \( $TIMESTAMP \> $SYSTEMDATE + 10000 \)`
         if [ $NEEDUPDATE -eq 1 ]; then 
-		date -s $TIMESTAMP
+		date -u $TIMESTAMP
 		/etc/init.d/hwclock.sh stop
 	fi
 fi

meta/recipes-core/initscripts/initscripts-1.0/save-rtc.sh

@@ -10,4 +10,4 @@
 ### END INIT INFO
 
 # Update the timestamp
-date +%Y%m%d%2H%2M > /etc/timestamp2
+date -u +%2m%2d%2H%2M%4Y > /etc/timestamp