Fix parsing of boolean values in flagfiles

Previously, settings in flagfiles without a value were considered false.
This change makes them true and also parses values with a "no" prefix as
false.

Unit tests included.

lib/puppet/provider/nova_config/parsed.rb

@@ -23,9 +23,12 @@ Puppet::Type.type(:nova_config).provide(
       if hash[:line] =~ /^\s*(\S+?)\s*=\s*([\S ]+)\s*$/
         hash[:name]=$1
         hash[:value]=$2
-      elsif hash[:line] =~ /^\s*(\S+)\s*$/
+      elsif hash[:line] =~ /^\s*no(\S+)\s*$/
         hash[:name]=$1
         hash[:value]=false
+      elsif hash[:line] =~ /^\s*(\S+)\s*$/
+        hash[:name]=$1
+        hash[:value]=true
       else
         raise Puppet::Error, "Invalid line: #{hash[:line]}"
       end

spec/unit/provider/nova_config/parsed_spec.rb

@@ -19,6 +19,18 @@ describe provider_class do
     record[:value].should == 'bar'
     record[:record_type].should == :parsed
   end
+  it 'should be able to parse settings without values' do
+    record = @provider.class.parse('--foo').first
+    record[:name].should == 'foo'
+    record[:value].should == true
+    record[:record_type].should == :parsed
+  end
+  it 'should be able to parse negated settings without values' do
+    record = @provider.class.parse('--nofoo').first
+    record[:name].should == 'foo'
+    record[:value].should == false
+    record[:record_type].should == :parsed
+  end
   it 'should be able to parse values that have spaces' do
     record = @provider.class.parse('--foo = bar or baz').first
     record[:name].should == 'foo'