Change the configuration file option

[vikman90]

Parent Issue: #241

Currently, the agent accepts the option:

wazuh-agent --config-path /path/to/wazuh.conf

Now, the default value is ./wazuh.conf.

We propose:

• Rename --config-path to --config-file, so that the option denotes that it refers to a file.
• Set the default value to /etc/wazuh-agent/wazuh-agent.yml.