Revert "Added "dsh update everything" to run a complete update sequence"

This reverts commit 283bc04.

bin/dsh

@@ -490,7 +490,6 @@ show_help ()
 	fi
 	echo "	update images		Update container images"
 	echo "	update dsh		Update dsh itself (ex. dsh self-update)"
-	echo "	update everything	Run full update sequence (update dsh, prerequisites and boot2docker VM on Mac/Windows)"
 	echo
 	echo "	version	(-v)		Print dsh version"
 	echo
@@ -941,21 +940,6 @@ update_dsh ()
 	exit
 }
 
-# Full update sequence
-update_everything ()
-{
-	echo-green "Updating dsh..."
-	update_dsh
-
-	echo-green "Updating prerequisites..."
-	install_prerequisites
-
-	if ! is_linux; then
-		echo-green "Updating boot2docker..."
-		update_boot2docker
-	fi
-}
-
 # Start interactive bash in container
 # @param $1 container name (defaults to cli)
 _bash ()
@@ -1307,10 +1291,8 @@ case $1 in
 			update_images
 		elif [[ "$1" == "dsh" ]]; then
 			update_dsh
-		elif [[ "$1" == "everything" ]]; then
-			update_everything
 		else
-			echo "Use dsh update [prerequisites|boot2docker|images|dsh|everything]"
+			echo "Use dsh update [prerequisites|boot2docker|images|dsh]"
 		fi
 		;;
 	self-update)