Allow use of rake db tasks

[#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.)

.gitignore

@@ -6,6 +6,8 @@
 .yardoc
 # Mac OS X files
 .DS_Store
+# database config for testing
+config/database.yml
 # simplecov coverage data
 coverage
 data/meterpreter/ext_server_pivot.dll

Rakefile

@@ -2,6 +2,18 @@ require 'bundler/setup'
 
 require 'metasploit_data_models'
 
+#
+# load rake files like a rails engine
+#
+
+pathname = Pathname.new(__FILE__)
+root = pathname.parent
+rakefile_glob = root.join('lib', 'tasks', '**', '*.rake').to_path
+
+Dir.glob(rakefile_glob) do |rakefile|
+  load rakefile
+end
+
 print_without = false
 
 begin
@@ -12,7 +24,7 @@ rescue LoadError
 
 	print_without = true
 else
-	RSpec::Core::RakeTask.new(:spec)
+	RSpec::Core::RakeTask.new(:spec => 'db:test:prepare')
 
 	task :default => :spec
 end

config/database.yml.example

@@ -0,0 +1,21 @@
+# Please only use postgresql bound to a TCP port.
+development: &pgsql
+  adapter: postgresql
+  database: metasploit_framework_development
+  username: metasploit_framework_development
+  password: __________________________________
+  host: localhost
+  port: 5432
+  pool: 5
+  timeout: 5
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+#
+# Note also, sqlite3 is totally unsupported by Metasploit now.
+test:
+  <<: *pgsql
+  database: metasploit_framework_test
+  username: metasploit_framework_test
+  password: ___________________________