engine: sort disks by ID in webadmin

Add to search of Disks tab the ability to sort by disk id.

Change-Id: I373260552d1656dc15da8def6ecfed9e74022675
Signed-off-by: Alissa Bonas <abonas@redhat.com>
core: [cleanup] tiny cleanups

This patch contains:
1. change the indentation in HibernateVmCommand#getAuditLogTypeValue to
make it more readable
2. simplified AsyncTaskManager#hasTasksForEntityIdAndAction structure
3. replace ArrayList with List in VdsActionParameterBase public methods
signatures

Change-Id: I7bbfc040e06ff1cfd48ba02a5992d0d533d9e75f
Signed-off-by: Arik Hadas <ahadas@redhat.com>