cmdlib: be able to parse --myrouter-port argument and ignore it

Summary: also includes a fix for blobimportjob passing an empty argument to blobimport when was not used

Reviewed By: farnz

Differential Revision: D10298965

fbshipit-source-id: 1e9475c53a7e0b7ea211cc8fbd2c327327b66c65

cmdlib/src/args.rs

@@ -89,6 +89,12 @@ impl MononokeApp {
                     .default_value("0")
                     .help("numeric ID of repository")
             )
+            .arg(
+                Arg::with_name("myrouter-port")
+                    .long("myrouter-port")
+                    .value_name("PORT")
+                    .help("port for local myrouter instance")
+            )
             .arg(
                 Arg::with_name("log-style")
                     .short("l")
@@ -444,7 +450,7 @@ fn open_repo_internal<'a>(
         blobrepo,
         &Default::default(),
         Arc::new(hook_manager),
-        None
+        None,
     ))
 }