Merge pull request #133 from qiangzii/master

- update delete lb, update change lb eip; 
- update default backend count for filter nodes by labels; 
- update makefile and dockerfile, add arm support;
- fix ensure sg panic;

Author: yongchuanzhou

Makefile

@@ -49,4 +49,4 @@ vet:
 .PHONY : clean
 
 push:
-	docker buildx build -t ${IMG} --platform=linux/amd64,linux/arm64 -f deploy/DockerfileWithBuilder . --push
+	docker buildx build -t ${IMG} --platform=linux/amd64,linux/arm64 -f deploy/DockerfileWithBuilder . --push