Remove Vagrant-based Oracle XE setup

The Vagrant workflow is superseded by the .devcontainer/ setup added
in rsim#276, which boots gvenzl/oracle-free in a container and provisions
the same hr and arunit accounts the spec suite expects via the
existing ci/setup_accounts.sh. Maintaining both paths is unnecessary;
the Vagrant configuration also targets a CentOS 7.2 box and the
Oracle XE 11.2.0 RPM, which is no longer readily distributable.

Removed:

- Vagrantfile
- spec/support/file_check_script.sh — only invoked by the Vagrantfile
  to verify the Oracle XE installer was placed in the project root
- spec/support/test_db.rb — only invoked under USE_VM_DATABASE=Y and
  hardcoded to the XE service, system/oracle credentials, and the
  /u01/app/oracle/oradata/XE paths inside the Vagrant box
- USE_VM_DATABASE branches in spec/spec_helper.rb
- .vagrant entry from .gitignore
- Vagrant sections from README.md TESTS instructions

History.txt entries that mention the Vagrant box are left as
historical changelog records.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: yahonda

.gitignore

@@ -10,6 +10,5 @@ tmp
 sqlnet.log
 Gemfile.lock
 *.zip
-.vagrant
 .idea
 spec/support/custom_config.rb

README.md

@@ -184,13 +184,7 @@ Review `spec/spec_helper.rb` to see default schema/user names and database names
 
 ##### Prepare database
 
-* With local [Vagrant](https://www.vagrantup.com) based Oracle XE database.
-
-    Download Oracle XE database ```oracle-xe-11.2.0-1.0.x86_64.rpm.zip``` from [Oracle Home page](http://www.oracle.com/technetwork/database/database-technologies/express-edition/downloads/index.html) and put it into project home directory.
-
-    From project home directory run ```vagrant up``` command to build fully functioning **Centos 6.6** virtual machine with installed Oracle XE database.
-
-* Within other Oracle Database create Oracle database schema for test purposes.
+In an Oracle Database create the following schemas for test purposes.
 
         SQL> CREATE USER hr IDENTIFIED BY hr;
         SQL> GRANT unlimited tablespace, create session, create table, create sequence, create procedure, create type, create view, create synonym TO hr;
@@ -210,12 +204,6 @@ Review `spec/spec_helper.rb` to see default schema/user names and database names
 
 ##### Run tests
 
-* Run tests with local Vagrant based Oracle XE database
-
-        USE_VM_DATABASE=Y rake spec
-
-* Run tests with other Oracle database
-
         rake spec
 
 LINKS

Vagrantfile

@@ -39,26 +39,14 @@
 # in spec/support/ and its subdirectories.
 Dir[File.join(File.dirname(__FILE__), "support/**/*.rb")].each { |f| require f }
 
-if ENV["USE_VM_DATABASE"] == "Y"
-  DATABASE_NAME = "XE"
-else
-  DATABASE_NAME = ENV["DATABASE_NAME"] || "orcl"
-end
-
+DATABASE_NAME = ENV["DATABASE_NAME"] || "orcl"
 DATABASE_SERVICE_NAME = ENV["DATABASE_SERVICE_NAME"] || DATABASE_NAME
 DATABASE_HOST = ENV["DATABASE_HOST"] || "localhost"
 DATABASE_PORT = (ENV["DATABASE_PORT"] || 1521).to_i
 DATABASE_USERS_AND_PASSWORDS = [
   [ENV["DATABASE_USER"] || "hr", ENV["DATABASE_PASSWORD"] || "hr"],
   [ENV["DATABASE_USER2"] || "arunit", ENV["DATABASE_PASSWORD2"] || "arunit"]
 ]
-if ENV["USE_VM_DATABASE"] == "Y"
-  RSpec.configure do |config|
-    config.before(:suite) do
-      TestDb.build
-    end
-  end
-end
 
 def oracle_error_class
   unless defined?(JRUBY_VERSION)