initram: try continue boot after emergency shell exit

sometimes it is possible to manually fix the problem, for example mount
the alpine device manually after modprobing the correct modules. Then it
makes sense to continue boot rather than just die.

initramfs-init

@@ -28,8 +28,8 @@ eend() {
 	else
 		shift
 		echo "failed. $*"
-		echo "initramfs emergency recovery shell launched"
-		exec /bin/busybox sh
+		echo "initramfs emergency recovery shell launched. Type 'exit' to continue boot"
+		/bin/busybox sh
 	fi
 }