RSpecs: Add component_manager and property to link Ads

[ahelsing@bbn.com]

Add <component_manager> and <property> sub-elements on <link> elements.

<property> as in the ad RSpec schema:

 <xs:complexType name="LinkPropertyContents">
    <xs:group ref="rspec:AnyExtension"/>
    <xs:attributeGroup ref="rspec:AnyExtension"/>
    <xs:attribute name="source_id" use="required"/>
    <xs:attribute name="dest_id" use="required"/>
    <xs:attribute name="capacity"/>
    <xs:attribute name="latency"/>
    <xs:attribute name="packet_loss"/>
  </xs:complexType>

Where source_id and dest_id are the component_ids of the interfaces at the end points.

component_manager as in: manifest-request.xsd:

  <xs:element name="component_manager">
    <xs:complexType>
      <xs:attribute name="name" use="required"/>
    </xs:complexType>
  </xs:element>

[ahelsing@bbn.com]

Of the 2, component_manager is more important.