Fixup validation for Puppet 2.6.8

Anonymous arrays and comparing booleans does not work in 2.6.8 like they
do in master.  In 2.6.8 we cannot compare a true / false variable to a
string inside of Ruby without forcing the function argument to be a
string.

manifests/init.pp

@@ -17,8 +17,11 @@ class java(
   $version='1.6.0_25-fcs'
 ) {
 
-  validate_re($jre, [ '^true$', '^false$' ])
-  validate_re($jdk, [ '^true$', '^false$' ])
+  # Cannot pass anonymous arrays to functions in 2.6.8
+  $v_true_false = [ '^true$', '^false$' ]
+  # Must compare string values, not booleans.
+  validate_re("$jre", $v_true_false)
+  validate_re("$jdk", $v_true_false)
   validate_re($version, '^[._0-9a-zA-Z:-]+$')
 
   $jre_real     = $jre