Falcon支持服务树

在开源版本的OpenFalcon基础之上增加了服务树的支持，从服务树配置告警策略，而不仅仅使用主机与主机组.

主要的修改细节见如下几个commit:

Name		Name	Last commit message	Last commit date
Latest commit History 1,074 Commits
cmd		cmd
common		common
config		config
docker		docker
docs		docs
g		g
logos		logos
modules		modules
scripts/mysql		scripts/mysql
test		test
vagrant		vagrant
.dockerignore		.dockerignore
.gitignore		.gitignore
.travis.yml		.travis.yml
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
Dockerfile		Dockerfile
Dockerfile.module		Dockerfile.module
Dockerfile_arm64		Dockerfile_arm64
LICENSE		LICENSE
Makefile		Makefile
NOTICE		NOTICE
README.md		README.md
VERSION		VERSION
api-standard.md		api-standard.md
docker-compose.yml		docker-compose.yml
docker_test.sh		docker_test.sh
falcon_README.md		falcon_README.md
go.mod		go.mod
go.sum		go.sum
logo.png		logo.png
main.go		main.go
version.go		version.go

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