Revision 1724231

[ARIES-1476] Support 0 or multiple OsgiServiceProvider#classes.

- 0 classes adds auto-export="interfaces" to the service element
- multiple classes adds the interfaces (e.g. A and B) to the interfaces
  element:
<service ref="ref">
    <interfaces>
        <value>A</value>
        <value>B</value>
    </interfaces>
<service/>