Feature/agent auth cert key

[LuisGi93]

This PR was made by @brettmiller - #70. Because of conflicts a new PR was needed.
It allows to define the content of the agent.cert and the agent.key at the Wazuh agent so it is possible to verify the agent using SSL .

In order to try the changes that includes this PR a manifest need to be defined specifying the content of the agent.cert and agent.key:

node "debian-n" {

  class { "wazuh::client":
    ossec_server_ip => "x.x.y.y",
    wazuh_manager_root_ca_pem =>'-----BEGIN CERTIFICATE-----
    MIIDKzCCAhOgAwIBAgIJAIrW2nHTFcjWMA0GCSqGSIb3DQEBCwUAMCwxCzAJBgNV
    -----END CERTIFICATE-----
    ',
    wazuh_agent_key_content =>'-----BEGIN PRIVATE KEY-----
    MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC/heNpsQXGmOzG
    -----END PRIVATE KEY-----
    ',
    wazuh_agent_cert_content =>'-----BEGIN CERTIFICATE-----
    MIIC7TCCAdUCCQDegENY9CSgyjANBgkqhkiG9w0BAQsFADAsMQswCQYDVQQGEwJV
    -----END CERTIFICATE-----
    ',
  }

}