make graceperiod configurable for container functions (#2337)

pkg/fission-cli/flag/flag.go

@@ -125,6 +125,8 @@ var (
 	FnRequestsPerPod        = Flag{Type: Int, Name: flagkey.FnRequestsPerPod, Aliases: []string{"rpp"}, Usage: "Maximum number of concurrent requests that can be served by a specialized pod", DefaultValue: 1}
 	FnOnceOnly              = Flag{Type: Bool, Name: flagkey.FnOnceOnly, Aliases: []string{"yolo"}, Usage: "Specifies if specialized pod will serve exactly one request in its lifetime"}
 	FnSubPath               = Flag{Type: String, Name: flagkey.FnSubPath, Usage: "Sub Path to check if function internally supports routing"}
+	// Termination Grace Period configurable at function creation/update only for container functions
+	FnTerminationGracePeriod = Flag{Type: Int64, Name: flagkey.FnGracePeriod, Usage: "Grace time (in seconds) for pod to perform connection draining before termination (default value will be used if negative value is given)", DefaultValue: 360}
 
 	HtName              = Flag{Type: String, Name: flagkey.HtName, Usage: "HTTP trigger name"}
 	HtMethod            = Flag{Type: StringSlice, Name: flagkey.HtMethod, Usage: "HTTP Methods: GET,POST,PUT,DELETE,HEAD. To mention single method: --method GET and for multiple methods --method GET --method POST. [DEPRECATED for 'fn create', use 'route create' instead]", DefaultValue: []string{http.MethodGet}}

pkg/fission-cli/flag/key/key.go

@@ -76,6 +76,7 @@ const (
 	FnRequestsPerPod        = "requestsperpod"
 	FnOnceOnly              = "onceonly"
 	FnSubPath               = "subpath"
+	FnGracePeriod           = "graceperiod"
 
 	HtName              = resourceName
 	HtMethod            = "method"