[services] Turn all services into singletons.
* Extend the example plugin to send the anonymous ID.

Change-Id: Idafbfbc8568f2d3b441be71d5f308c0f8df75781
Signed-off-by: Yasser Aziza <yasser.aziza@gmail.com>
[ui] Bug 440721: Display list of interested parties in the user id preference page.

Change-Id: I89ba088f5f026a94f5e08918f03b62f14dae1e75
Signed-off-by: Yasser Aziza <yasser.aziza@gmail.com>
Signed-off-by: Andreas Sewe <andreas.sewe@codetrails.com>