Labels and annotation support for functions and environments (#2113)

1. Support for adding labels and annotations to functions & environment via fission CLI through create & update command.
2. Change ensures labels and annotations assigned to the environment would reflect on pods created via executor type pool manager and new deploy.

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/fission-cli/cmd/function/update.go

@@ -243,6 +243,11 @@ func (opts *UpdateSubCommand) complete(input cli.Input) error {
 
 	opts.function = function
 
+	err = util.ApplyLabelsAndAnnotations(input, &opts.function.ObjectMeta)
+	if err != nil {
+		return err
+	}
+
 	return nil
 }