Change agent queue member association to members
Associate an agent to a queue
Return location on associate
Send error if queue or agent doest not exists

on agent queue association
Removed unused code in agent queue edition
Raise error if agent already associated
Remove agent from queue
Merge branch 'create_agent_queue_association' of https://github.com/jlebleu/xivo-confd into jlebleu-create_agent_queue_association
fix unit tests

get_by_agent_id_and_agent_id is not used anymore
Merge branch 'jlebleu-create_agent_queue_association'