[fix] 1,修复读写并发问题 2，修复search查询出错不返回err 3，解除健康检查对etcd的依赖 4，golang-lint问题修复 #555

	name: Merge check
	on: [push, pull_request]
	jobs:
	etcd-storage:
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go
	uses: actions/setup-go@v1
	with:
	go-version: 1.18
	id: go
	- name: Check out code into the Go module directory
	uses: actions/checkout@v1
	- name: UT for etcd
	run: \|
	time docker run -d -p 2379:2379 --name etcd quay.io/coreos/etcd etcd -name etcd --advertise-client-urls http://0.0.0.0:2379 --listen-client-urls http://0.0.0.0:2379
	while ! nc -z 127.0.0.1 2379; do
	sleep 1
	done
	export TEST_DB_KIND=etcd
	export TEST_DB_URI=127.0.0.1:2379
	time go test $(go list ./... \| grep -v mongo \| grep -v third_party \| grep -v examples)
	embedded-etcd-storage:
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go
	uses: actions/setup-go@v1
	with:
	go-version: 1.18
	id: go
	- name: Check out code into the Go module directory
	uses: actions/checkout@v1
	- name: UT for embedded etcd
	run: \|
	export TEST_DB_KIND=embedded_etcd
	go test $(go list ./... \| grep -v mongo \| grep -v third_party \| grep -v examples)

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