tools: Fixing RootDSEData bind

Changing the way RootDSE is obtained at manage domains
to the way it is obtained at engine -
Using SIMPLE bind with no credentials.

Change-Id: I6b5709ba7f01eb34cfb72f271f3963e0e635f2a5
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>