Fix command parameter checks
Fix command parameter checks

parameter_checks, parameter_types and parameters_by_type are instance
attributes, not class attributes. Defining parameter_types and
parameters_by_type at the class level meant all classes used the same
dict().

Reviewed-By: Wesley Hertlein <ca32100e9f664971b15d1470ddc7f009d907efd3@morganstanley.com>

stdweird/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,quattor/aquilon,guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon,guillaume-philippon/aquilon,stdweird/aquilon