test: bump up test timeout to 20m

Recently, we've added bunch of tests...

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

test

@@ -234,7 +234,7 @@ function cov_pass {
 	mkdir -p "$COVERDIR"
 
 	# run code coverage for unit and integration tests
-	GOCOVFLAGS="-covermode=set -coverpkg ${PKGS_COMMA} -v -timeout 15m"
+	GOCOVFLAGS="-covermode=set -coverpkg ${PKGS_COMMA} -v -timeout 20m"
 	# shellcheck disable=SC2206
 	GOCOVFLAGS=($GOCOVFLAGS)
 	failed=""
@@ -292,7 +292,7 @@ function e2e_pass {
 	# expectation could be different
 	USERTIMEOUT=""
 	if [ -z "${TIMEOUT}" ]; then
-		USERTIMEOUT="15m"
+		USERTIMEOUT="20m"
 	else
 		USERTIMEOUT="${TIMEOUT}"
 	fi
@@ -303,9 +303,9 @@ function e2e_pass {
 function integration_e2e_pass {
 	echo "Running integration and e2e tests..."
 
-	go test -timeout 15m -v -cpu 1,2,4 "$@" "${REPO_PATH}/e2e" &
+	go test -timeout 20m -v -cpu 1,2,4 "$@" "${REPO_PATH}/e2e" &
 	e2epid="$!"
-	go test -timeout 15m -v -cpu 1,2,4 "$@" "${REPO_PATH}/integration" &
+	go test -timeout 20m -v -cpu 1,2,4 "$@" "${REPO_PATH}/integration" &
 	intpid="$!"
 	wait $e2epid
 	wait $intpid
@@ -315,7 +315,7 @@ function integration_e2e_pass {
 function grpcproxy_pass {
 	go test -timeout 20m -v ${RACE} -tags cluster_proxy -cpu 1,2,4 "$@" "${REPO_PATH}/integration"
 	go test -timeout 20m -v ${RACE} -tags cluster_proxy -cpu 1,2,4 "$@" "${REPO_PATH}/clientv3/integration"
-	go test -timeout 15m -v -tags cluster_proxy "$@" "${REPO_PATH}/e2e"
+	go test -timeout 20m -v -tags cluster_proxy "$@" "${REPO_PATH}/e2e"
 }
 
 function release_pass {