[cdc_stream] Fix issues found in tests (#40)

* [cdc_stream] Fix issues found in tests

Fixes a couple of issues found by integration testing:
- Unicode command line args in cdc_stream show up as question marks.
- Log is still named assets_stream_manager instead of cdc_stream.
- An error message contains stadia_assets_stream_manager_v3.exe.
- mount_dir was not the last arg as required by FUSE
- Promoted cache cleanup logs to INFO level since they're important
  for the proper workings of the system.
- Asset streaming cache dir is still %APPDATA%\GGP\asset_streaming.

* Address comments

cdc_stream/cdc_fuse_manager.cc

@@ -26,6 +26,7 @@
 namespace cdc_ft {
 namespace {
 
+constexpr char kExeFilename[] = "cdc_stream.exe";
 constexpr char kFuseFilename[] = "cdc_fuse_fs";
 constexpr char kLibFuseFilename[] = "libfuse.so";
 constexpr char kFuseStdoutPrefix[] = "cdc_fuse_fs_stdout";
@@ -95,8 +96,8 @@ absl::Status CdcFuseManager::Start(const std::string& mount_dir,
   if (!status.ok()) {
     return absl::NotFoundError(absl::StrFormat(
         "Required gamelet component not found. Make sure the files %s and %s "
-        "reside in the same folder as stadia_assets_stream_manager_v3.exe.",
-        kFuseFilename, kLibFuseFilename));
+        "reside in the same folder as %s.",
+        kFuseFilename, kLibFuseFilename, kExeFilename));
   }
   std::string component_args = GameletComponent::ToCommandLineArgs(components);
 
@@ -113,8 +114,8 @@ absl::Status CdcFuseManager::Start(const std::string& mount_dir,
       RemoteUtil::QuoteForSsh(instance_),
       RemoteUtil::QuoteForSsh(component_args), remote_port, kCacheDir,
       verbosity, cleanup_timeout_sec, access_idle_timeout_sec, enable_stats,
-      check, cache_capacity, RemoteUtil::QuoteForSsh(mount_dir),
-      debug ? " -d" : "", singlethreaded ? " -s" : "");
+      check, cache_capacity, debug ? "-d " : "", singlethreaded ? "-s " : "",
+      RemoteUtil::QuoteForSsh(mount_dir));
 
   bool needs_deploy = false;
   RETURN_IF_ERROR(