show warning message to reset env when credential is removed (#49)

Author: zyjiaobj

src/cli/commands/delete_credential.go

@@ -48,5 +48,6 @@ func DeleteCredential(cliConnection api.Connection, appName string) error {
 	}
 
 	ui.SayOK()
+	ui.SayWarningMessage(ui.DeleteCredentialWarning, appName)
 	return nil
 }

src/cli/main_test.go

@@ -1884,6 +1884,7 @@ var _ = Describe("App-AutoScaler Commands", func() {
 
 								Expect(session.Out).To(gbytes.Say(ui.DeleteCredentialHint, fakeAppName))
 								Expect(session.Out).To(gbytes.Say("OK"))
+								Expect(session.Out).To(gbytes.Say(ui.DeleteCredentialWarning, fakeAppName))
 								Expect(session.ExitCode()).To(Equal(0))
 							})
 

src/cli/ui/message.go

@@ -48,5 +48,6 @@ const (
 
 	MoreRecordsWarning      = "TIP: More records available. Please re-run the command with --start or --end option to fetch more."
 	DeprecatedDescWarning   = "TIP: The default order is set to descending now. Please remove the DEPRECATED flag '--desc'."
-	CreateCredentialWarning = "TIP: A new credential generated. Please update the credential setting, and use 'cf restart %s' to ensure your env variable changes take effect."
+	CreateCredentialWarning = "TIP: A new credential generated. Please update the credential setting of your application, and use 'cf restart %s' to ensure your env variable changes take effect."
+	DeleteCredentialWarning = "TIP: The credential removed. Please remove the credential setting from your application, and use 'cf restart %s' to ensure your env variable changes take effect."
 )