Assorted refactoring

Mostly removing duplication. Also added a comment as suggested by
Andrew.

Bug: 161471326
Test: composd_cmd async-odrefresh

Change-Id: I7da83cb825de7b4fd2267b1e496808a423544c16
diff --git a/compos/common/lib.rs b/compos/common/lib.rs
index 5c28379..6e397a2 100644
--- a/compos/common/lib.rs
+++ b/compos/common/lib.rs
@@ -16,6 +16,7 @@
 
 //! Common items used by CompOS server and/or clients
 
+pub mod binder;
 pub mod compos_client;
 pub mod odrefresh;
 pub mod timeouts;