Sort specs

MSP-11466
Spec methods from db_manager.rb

MSP-11466
Add modern --require to .rspec

MSP-11466

Modern rspec --init adds `--require spec_helper` to .rspec so that you
don't need to `require 'spec_helper` in all your specs.
Spec classes, constants and methods from lib/msf/db.rb

MSP-11466

Method specces only check that the method is defined as they only need
to catch deleted methods during the reorganization.
Merge branch 'landing/3971' into HEAD

Land #3791 - specs for code reorg