server account manager: add user search support

bin/dbus/cx.ring.Ring.ConfigurationManager.xml

bin/dbus/dbusclient.cpp

bin/dbus/dbusconfigurationmanager.cpp

bin/dbus/dbusconfigurationmanager.h

bin/jni/configurationmanager.i

bin/jni/jni_interface.i

bin/nodejs/configurationmanager.i

bin/nodejs/nodejs_interface.i

src/client/configurationmanager.cpp

src/client/ring_signal.cpp

src/dring/configurationmanager_interface.h

src/jamidht/account_manager.h

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/jamidht/namedirectory.h

src/jamidht/server_account_manager.cpp

src/jamidht/server_account_manager.h