Enabling default runtime to run multiple versions (#1545)

* Enabling default runtime to run multiple versions

* Trigger build

* Fix

* Sprintf

runtime/service.go

@@ -1,6 +1,7 @@
 package runtime
 
 import (
+	"fmt"
 	"io"
 	"strconv"
 	"strings"
@@ -76,6 +77,10 @@ func (s *service) shouldStart() bool {
 	return s.retries <= s.maxRetries
 }
 
+func (s *service) key() string {
+	return fmt.Sprintf("%v:%v", s.Name, s.Version)
+}
+
 func (s *service) ShouldStart() bool {
 	s.RLock()
 	defer s.RUnlock()