Warn when using --[no-]tests flags in install.rb

The tests flag isn't functional anymore, as there are no tests in the test
directory to run. This commit adds a warning for users of the tests flag that
the flag is useless. It also changes the default value for the tests flag to
false and promises that we will remove the flag entirely in the future.

install.rb

@@ -179,8 +179,6 @@ def prepare_installation
   end
 
 
-  InstallOptions.tests = true
-
   ARGV.options do |opts|
     opts.banner = "Usage: #{File.basename($0)} [options]"
     opts.separator ""
@@ -190,8 +188,9 @@ def prepare_installation
     opts.on('--[no-]ri', 'Prevents the creation of RI output.', 'Default off on mswin32.') do |onri|
       InstallOptions.ri = onri
     end
-    opts.on('--[no-]tests', 'Prevents the execution of unit tests.', 'Default on.') do |ontest|
+    opts.on('--[no-]tests', 'Prevents the execution of unit tests.', 'Default off.') do |ontest|
       InstallOptions.tests = ontest
+      warn "The tests flag is no longer functional in Puppet and is deprecated as of Dec 19, 2012. It will be removed in a future version of Puppet."
     end
     opts.on('--[no-]configs', 'Prevents the installation of config files', 'Default off.') do |ontest|
       InstallOptions.configs = ontest
@@ -217,13 +216,11 @@ def prepare_installation
     opts.on('--quick', 'Performs a quick installation. Only the', 'installation is done.') do |quick|
       InstallOptions.rdoc    = false
       InstallOptions.ri      = false
-      InstallOptions.tests   = false
       InstallOptions.configs = true
     end
     opts.on('--full', 'Performs a full installation. All', 'optional installation steps are run.') do |full|
       InstallOptions.rdoc    = true
       InstallOptions.ri      = true
-      InstallOptions.tests   = true
       InstallOptions.configs = true
     end
     opts.separator("")