ServerState.java:
Assigned serverIdToChangeNumber field in the declaration.
In reload(), called update().
In cover(ServerState), cover(ChangeNumber).
In duplicate(), called Map.putAll().

DraftCNDbHandler.java:
In clear(String), removed useless code.

ExternalChangeLogTest.java:
Renamed createDomain() to startNewDomain().
In initializeTestBackend(), removed one parameter.
Renamed removeTestBackend2() to removeTestBackend() + Removed useless null checks around the calls to it.