Allow using URL as archive source when creating functions (#1360)

In the case of large files, it takes a long time for the user to download
the source from the URL and upload it to StorgeSvc through CLI.

This PR allows a user to use URL as the function source when creating a function
and provides a new flag "--keeparchiveurl" to let the user to decided
whether the CLI should download the file first or store the file URL in the
archive directly. If "--keeparchiveurl" is true, then no checksum will be
generated, it's the user's responsibility to ensure the file won't be changed.

pkg/fission-cli/cmd/support/dump.go

@@ -146,7 +146,7 @@ func (opts *DumpSubCommand) do(flags cli.Input) error {
 	if !nozip {
 		defer os.RemoveAll(tempDir)
 		path := filepath.Join(outputDir, fmt.Sprintf("%v.zip", dumpName))
-		_, err := utils.MakeArchive(path, tempDir)
+		_, err := utils.MakeZipArchive(path, tempDir)
 		if err != nil {
 			fmt.Printf("Error creating archive for dump files: %v", err)
 			return err