account: check if password is valid

src/client/configurationmanager.cpp

src/dring/configurationmanager_interface.h

src/jamidht/account_manager.h

src/jamidht/archive_account_manager.cpp

src/jamidht/archive_account_manager.h

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/manager.cpp

src/manager.h