Research and Refactor Agent Simulator for Remoted test

[damarisg]

This issue is created because there are some remoted tests that are failing because the simulated agents always have a never connected status. This requires analyzing the implementation of the send_keepalive code to identify why sometimes the keepalives are not being received by the manager.

We performed an initial assessment and we saw that the HC_STARTUP message and keepalives are being sent together without any timelapse between them. This is not the actual behavior of an agent. But despite this, that would result in agents not being set in a pending status, there seem to be some keepalive messages not arriving at the manager and this results in agents never being set as active.

The tests affected by this issue are:

• test_remoted/test_active_response/test_active_response_send_ar
• test_remoted/test_agent_communication/test_multi_agent_status

[damarisg]

We decided to close them as it was not planned.