[client][DBClientConfig] Add ServerQueryOption
[server] Add access control feature for getting servers
[server][DBClientConfig] Add tests for ServerQueryOption::getCondition()
[server] Add missing "virtual" keyword
[server][testDBClientConfig] Add some tests for getTargetServers()
[server][testDBClientConfig] Add more tests for getTargetServers()
Merge branch 'issue58-3'

Conflicts:
	server/src/FaceRest.cc