MSP-9606
In order to support Metasploit::Credential correctly,
metasploit-framework needs to support Metasploit::Concern, which does
all its magic using a Rails::Engine initializer, so the easiest path is
to make metasploit-framework be able to use Rails::Engines. To make
Rails::Engine use Rails::Engine, make a dummy Rails::Application
subclass so that all the initializers will be run when anything requires
msfenv.
[#46224565]
The following rake tasks are added and work similar to how they work in
rails apps:
* db:create
* db:drop
* db:migrate
* db:migrate:status
* db:rollback
* db:schema:dump
* db:schema:load
* db:seed (but no db seeds defined at this time)
* db:setup
* db:version
The hidden task db:test:prepare is also available, which means `rake
spec` can depend on it so that the test database is dropped and
recreated from the development database when running specs (Although
there are yet to be database tests, this branch is in preparation for
that work that will be split between multiple developers.)
