cleanup spurious comments and info log. (envoyproxy#19968)

Signed-off-by: Joshua Marantz <jmarantz@google.com>

Commit Message: Demotes an info log to a debug log, and removes some spurious comments
Additional Description:
Risk Level: low
Testing: //test/server/admin/...
Docs Changes: n/a
Release Notes: n/a
Platform Specific Features: n/a

source/server/admin/admin.cc

@@ -315,7 +315,7 @@ Http::Code AdminImpl::runCallback(absl::string_view path_and_query,
                                   Http::ResponseHeaderMap& response_headers,
                                   Buffer::Instance& response, AdminStream& admin_stream) {
   HandlerPtr handler = findHandler(path_and_query, admin_stream);
-  Http::Code code = handler->start(/*path_and_query, */ response_headers);
+  Http::Code code = handler->start(response_headers);
   bool more_data;
   do {
     more_data = handler->nextChunk(response);

source/server/admin/admin_filter.cc

@@ -68,7 +68,7 @@ void AdminFilter::onComplete() {
   auto header_map = Http::ResponseHeaderMapImpl::create();
   RELEASE_ASSERT(request_headers_, "");
   Admin::HandlerPtr handler = admin_handler_fn_(path, *this);
-  Http::Code code = handler->start(/*path, */ *header_map);
+  Http::Code code = handler->start(*header_map);
   Utility::populateFallbackResponseHeaders(code, *header_map);
   decoder_callbacks_->encodeHeaders(std::move(header_map), false,
                                     StreamInfo::ResponseCodeDetails::get().AdminFilterResponse);
@@ -78,7 +78,7 @@ void AdminFilter::onComplete() {
     Buffer::OwnedImpl response;
     more_data = handler->nextChunk(response);
     bool end_stream = end_stream_on_complete_ && !more_data;
-    ENVOY_LOG_MISC(info, "nextChunk: response.length={} more_data={} end_stream={}",
+    ENVOY_LOG_MISC(debug, "nextChunk: response.length={} more_data={} end_stream={}",
                    response.length(), more_data, end_stream);
     if (response.length() > 0 || end_stream) {
       decoder_callbacks_->encodeData(response, end_stream);