Added ignorenotfound flag for all resources' deletion (#2293)

Treat \"resource not found\" as a successful delete if ignorenotfound flag passed while deletion of Fission resource.

pkg/fission-cli/flag/flag.go

@@ -76,6 +76,8 @@ var (
 
 	KubeContext = Flag{Type: String, Name: flagkey.KubeContext, Usage: "Kubernetes context to be used for the execution of Fission commands", DefaultValue: ""}
 
+	IgnoreNotFound = Flag{Type: Bool, Name: flagkey.IgnoreNotFound, Usage: "Treat \"resource not found\" as a successful delete.", DefaultValue: false}
+
 	Labels     = Flag{Type: String, Name: flagkey.Labels, Usage: "Comma separated labels to apply to the function. E.g. --labels=\"environment=dev,application=analytics\""}
 	Annotation = Flag{Type: StringSlice, Name: flagkey.Annotation, Usage: "Annotation to apply to the function. To mention multiple annotations --annotation=\"abc.com/team=dev\" --annotation=\"foo=bar\""}
 

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

@@ -29,6 +29,8 @@ const (
 	Labels     = "labels"
 	Annotation = "annotation"
 
+	IgnoreNotFound = "ignorenotfound"
+
 	NamespaceFunction    = "fnNamespace"
 	NamespaceEnvironment = "envNamespace"
 	NamespacePackage     = "pkgNamespace"