Add CLI flags to force http scheme in generated hrefs

Summary:
Add two new CLI flags to the LFS server:
- `--force-http-for-host`: hostnames for which generated hrefs should use http instead of https
- `--force-http-for-header`: header names whose presence (with value "1") forces http scheme

This is needed for x2p/c2p proxy scenarios where the downstream client expects plain http URLs.

Reviewed By: giorgidze

Differential Revision: D95236086

fbshipit-source-id: 707162a4ecb3349261adeddc0533b9a8cde2895d

Author: mzr

eden/mononoke/servers/lfs/lfs_server/src/batch.rs

@@ -931,12 +931,15 @@ mod test {
         let server = ServerUris::new(
             vec!["http://foo.com".to_string()],
             Some("http://bar.com".to_string()),
+            vec![],
+            vec![],
         )?;
         let uri_builder = UriBuilder {
             repository: "repo123".to_string(),
             server: Arc::new(server),
             host: "foo.com".to_string(),
             server_hostname: Arc::new(SERVER_HOSTNAME.to_string()),
+            force_http: false,
         };
 
         let res = batch_upload_response_objects(