add support for per-configuration property default values

[glennmatthews]

DSP 0243, 1.1.0, lines 1190-1206:

Configurations can further be used to control default values for properties. For Property elements inside a ProductSection, the following additional semantic is defined:

• It is possible to use alternative default property values for different configurations in a DeploymentOptionSection. In addition to a Label and Description element, each Property element may optionally contain Value elements. The Value element shall have an ovf:value attribute specifying the alternative default and an ovf:configuration attribute specifying the configuration in which this new default value should be used. Multiple Value elements shall not refer to the same configuration.

EXAMPLE 2: The following shows an example ProductSection:

    <ProductSection>
      <Property ovf:key="app.log" ovf:type="string" ovf:value="low"
ovf:userConfigurable="true">
        <Label>Loglevel</Label>
        <Description>Loglevel for the service</Description>
        <Value ovf:value="none" ovf:configuration="minimal">
      </Property>
    </ProductSection>

COT does not presently support this.