Changed callback logic to allow different ways to start new agents:  - When no node is selected, one can write the container name within    start dialog window.  - When a container node is selected the agent is started on that    agent container.  - When more container nodes are selected an agent is started on each    one of them.
Changed callback logic to allow different ways to start new agents:
 - When no node is selected, one can write the container name within
   start dialog window.
 - When a container node is selected the agent is started on that
   agent container.
 - When more container nodes are selected an agent is started on each
   one of them.


ekiwi/jade-mirror,ekiwi/jade-mirror,ekiwi/jade-mirror,ekiwi/jade-mirror