CP-26583: Register Rrdd PPX error printer, minor changes
CP-26583: Register Rrdd PPX error printer, minor changes

- remove obsolete TODO comment
- don't rewrite rrd_err definition, just use the functor provided
- change comment indentation for protocol error docstring
- reword docstring for master address parameter to load_rrd call

Signed-off-by: Akanksha Mathur <f738165c510d1d084a509dcd408ba2ad7c2d9ee3@citrix.com>

xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch