Remove redundant CONSTANTS section comment

MSP-10033
Fix typo and make class explicit

MSP-10033
Remove bypassed method

MSP-10033

Metasploit::Model::Search::Operator::Single#type only needs to be
overridden to automatically derive #operation_class_name, but
 #operation_class_name itself is overridden, so #type can remain
unimplemented.
Inline and remove EXTREMES constant for code readability

MSP-10033

MetpasloitDataModels::IPAddress::Range::EXTREMES was only used once, in
a private validator and not having the array of extremes inline actually
made the code harder to read, so just use the array directly and remove
the constant.