aaa: reactivate user

Reactive users in the following flow:
1. Login
2. AddUser
3. Periodic sync

reactivate will occur with syncing the directory groups

Change-Id: I556d8da48a858ce193865e84fb6c7cb4043a8e5b
Topic: AAA
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>