functional/tester: run tests with embedded etcd

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

functional.yaml

@@ -1,5 +1,5 @@
 agent-configs:
-- etcd-exec: ./bin/etcd
+- etcd-exec: embed
   agent-addr: 127.0.0.1:19027
   failpoint-http-addr: http://127.0.0.1:7381
   base-dir: /tmp/etcd-functional-1
@@ -50,7 +50,7 @@ agent-configs:
   peer-trusted-ca-path: ""
   snapshot-path: /tmp/etcd-functional-1.snapshot.db
 
-- etcd-exec: ./bin/etcd
+- etcd-exec: embed
   agent-addr: 127.0.0.1:29027
   failpoint-http-addr: http://127.0.0.1:7382
   base-dir: /tmp/etcd-functional-2
@@ -101,7 +101,7 @@ agent-configs:
   peer-trusted-ca-path: ""
   snapshot-path: /tmp/etcd-functional-2.snapshot.db
 
-- etcd-exec: ./bin/etcd
+- etcd-exec: embed
   agent-addr: 127.0.0.1:39027
   failpoint-http-addr: http://127.0.0.1:7383
   base-dir: /tmp/etcd-functional-3

functional/tester/cluster_test.go

@@ -28,7 +28,7 @@ func Test_read(t *testing.T) {
 	exp := &Cluster{
 		Members: []*rpcpb.Member{
 			{
-				EtcdExec:           "./bin/etcd",
+				EtcdExec:           "embed",
 				AgentAddr:          "127.0.0.1:19027",
 				FailpointHTTPAddr:  "http://127.0.0.1:7381",
 				BaseDir:            "/tmp/etcd-functional-1",
@@ -81,7 +81,7 @@ func Test_read(t *testing.T) {
 				SnapshotPath:        "/tmp/etcd-functional-1.snapshot.db",
 			},
 			{
-				EtcdExec:           "./bin/etcd",
+				EtcdExec:           "embed",
 				AgentAddr:          "127.0.0.1:29027",
 				FailpointHTTPAddr:  "http://127.0.0.1:7382",
 				BaseDir:            "/tmp/etcd-functional-2",
@@ -134,7 +134,7 @@ func Test_read(t *testing.T) {
 				SnapshotPath:        "/tmp/etcd-functional-2.snapshot.db",
 			},
 			{
-				EtcdExec:           "./bin/etcd",
+				EtcdExec:           "embed",
 				AgentAddr:          "127.0.0.1:39027",
 				FailpointHTTPAddr:  "http://127.0.0.1:7383",
 				BaseDir:            "/tmp/etcd-functional-3",