void userRemoved(String username) throws IOException {
		for (String repName : getRepositoryNames()) {
			getRepository(repName).removeUser(username);
		}
	}
Callback when user removed from server.  Remove user from all repository access lists.
@param username user name
@throws IOException if error occured while updating repository access lists.
Ghidra/Features/GhidraServer/src/main/java/ghidra/server/RepositoryManager.java