Add many more opcode parameters

This is a bulk add of all node parameters needed for node and cluster
opcodes. The parameters are defined with a few helper functions in
this module, and, opposite from opcodes.py, there won't be any (new)
opcode attributes declared in-line (without a separate field
definition).

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>