Add --dry option to view the generated spec without saving (#1504)

pkg/fission-cli/flag/flag.go

@@ -170,6 +170,7 @@ var (
 	SpecWait     = Flag{Type: Bool, Name: flagkey.SpecWait, Usage: "Wait for package builds"}
 	SpecWatch    = Flag{Type: Bool, Name: flagkey.SpecWatch, Usage: "Watch local files for change, and re-apply specs as necessary"}
 	SpecDelete   = Flag{Type: Bool, Name: flagkey.SpecDelete, Usage: "Allow apply to delete resources that no longer exist in the specification"}
+	SpecDry      = Flag{Type: Bool, Name: flagkey.SpecDry, Usage: "View the generated specs"}
 
 	SupportOutput = Flag{Type: String, Name: flagkey.SupportOutput, Short: "o", Usage: "Output directory to save dump archive/files", DefaultValue: flagkey.DefaultSpecOutputDir}
 	SupportNoZip  = Flag{Type: Bool, Name: flagkey.SupportNoZip, Usage: "Save dump information into multiple files instead of single zip file"}

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

@@ -125,6 +125,7 @@ const (
 	SpecWait     = "wait"
 	SpecWatch    = "watch"
 	SpecDelete   = "delete"
+	SpecDry      = "dry"
 
 	SupportOutput = Output
 	SupportNoZip  = "nozip"