This module is a subclass of Net::EPP::Frame that represents EPP client
Clients can send a greeting to an EPP server at any time during a session.
According to the EPP RFC, the server must transmit an EPP greeting frame to the
client upon connection, and in response to an EPP <hello> command.
The <greeting> frame provides information about the server,
including the server time, access control rules, and a list of the object
types that are provisioned by the server.