This fixes a huge number of hard-to-detect runtime bugs
that occur when a default utf-8 string from one of these
libraries is passed into a method expecting ascii-8bit
[#50179803]
[SeeRM #7967]
[SeeRM #7870]
Because metasploit-framework runs migrations with the same process and
with the same connection as it later accesses the database, the column
information can become cached prematurely and be incorrect by the end of
the migrations. Fix the bad cache by automatically resetting the column
information for all model classes after the migrations have run.
[#50179803]
Move Msf::DBManager#migrate and the migrated attribute to
Msf::DBManager::Migration module to lower complexity of db_manager.rb
and in preparation for more migration related code on this branch.
Gregory Mikeska