tools: Removes -interactive option from engine-manage-domains

Removes -interactive option from engine-manage-domains. If -passwordFile
option is not set, then the password will be read interactively.

Change-Id: I9bd764a50f6e6d237bc65d6e7a72ac2cc636786a
Bug-Url: https://bugzilla.redhat.com/904029
Signed-off-by: Martin Perina <mperina@redhat.com>