Add to the agent simulator the ability to register the agent in a different manager than the connection

[jmv74211]

Related issue
#1139

Description

This PR makes the following changes:

• Add to the agent simulator the ability to register the agent in a different manager than the connection
• Add the FIM alerts fix (it was not merged in 4.2)

Checks

• Python codebase satisfies PEP-8 style style guide. pycodestyle --max-line-length=120 --show-source --show-pep8 file.py.
• Python codebase is documented following the Google Style for Python docstrings.

Tests

• Tested on a cluster environment. The agent was registered in the master node and then connected to the worker node. The worker node got all the expected events from the agent.