FileAnalysis: small tweak to file handle generation.

For files that go over a single connection, add connection start time
to handle, so the file id will always differ even if the same connection
parameters are later used to transfer a file (same one or different).

src/HTTP.cc

@@ -855,6 +855,8 @@ void HTTP_Analyzer::Done()
 		Unref(unanswered_requests.front());
 		unanswered_requests.pop();
 		}
+
+	file_mgr->EndOfFile(Conn());
 	}
 
 void HTTP_Analyzer::DeliverStream(int len, const u_char* data, bool is_orig)