temporarily set aaf version to snapshot

temporarily set aaf version to snapshot

With the latest released version of AAF, encountered
problems when testing AAF.  This seems to be resolved
when migrating to the not-released yet, 2.1.2-SNAPSHOT.
Checking further into AAF jira's it seems that some
necessary fixes have gone into 2.1.2-SNAPSHOT (see for example
AAF-460).

The assumption is that 2.1.2-SNAPSHOT will be soon
released by AAF team, and then we should appropriately change
this version.

In addition, there has been enhancements to allow policy
apps to configure additional filters.   These will be used
initially by specific "rest" servers to provide additional
authorization capabilities.

Change-Id: I48e279738de20bd68e3f05323ad9b6cffdafc83e
Signed-off-by: Jorge Hernandez <jh1730@att.com>
Issue-ID: POLICY-1044
Signed-off-by: Jorge Hernandez <jh1730@att.com>