Added the Version method to executor

client/driver/executor/executor.go

@@ -37,6 +37,7 @@ type Executor interface {
 	UpdateTask(task *structs.Task) error
 	SyncServices(ctx *ConsulContext) error
 	DeregisterServices() error
+	Version() string
 }
 
 // ConsulContext holds context to configure the consul client and run checks
@@ -162,6 +163,11 @@ func NewExecutor(logger *log.Logger) Executor {
 	}
 }
 
+// Version returns the api version of the executor
+func (e *UniversalExecutor) Version() string {
+	return "1"
+}
+
 // LaunchCmd launches a process and returns it's state. It also configures an
 // applies isolation on certain platforms.
 func (e *UniversalExecutor) LaunchCmd(command *ExecCommand, ctx *ExecutorContext) (*ProcessState, error) {