upgrade to Retina v0.3.9

This alone improves interop and diagnostics, as noted in Retina's
release notes. We also now give the camera name to the session group
(for improved logging of TEARDOWN operations) and expose the RTSP
server's "tool" attribute in debug logs and the config UI's "Test"
button.

Fixes #209
Fixes #213

server/src/cmds/config/cameras.rs

@@ -214,7 +214,7 @@ fn press_test_inner(
         .enable_io()
         .build()?;
     let _guard = rt.enter();
-    let (extra_data, _stream) = stream::OPENER.open(
+    let (extra_data, stream) = stream::OPENER.open(
         &rt,
         "test stream".to_owned(),
         url,
@@ -227,8 +227,10 @@ fn press_test_inner(
             .transport(transport),
     )?;
     Ok(format!(
-        "{}x{} video stream",
-        extra_data.width, extra_data.height
+        "{}x{} video stream served by tool {:?}",
+        extra_data.width,
+        extra_data.height,
+        stream.tool(),
     ))
 }
 

server/src/cmds/run/mod.rs

@@ -13,6 +13,7 @@ use fnv::FnvHashMap;
 use hyper::service::{make_service_fn, service_fn};
 use log::error;
 use log::{info, warn};
+use retina::client::SessionGroup;
 use std::net::SocketAddr;
 use std::path::Path;
 use std::path::PathBuf;
@@ -324,7 +325,9 @@ async fn inner(
             let syncer = syncers.get(&sample_file_dir_id).unwrap();
             let session_group = session_groups_by_camera
                 .entry(camera.id)
-                .or_default()
+                .or_insert_with(|| {
+                    Arc::new(SessionGroup::default().named(camera.short_name.clone()))
+                })
                 .clone();
             let mut streamer = streamer::Streamer::new(
                 &env,