engine: VmInit root-password not fetch from DB

By default we don't fetch the password when getting VmInit for security
reasons (we don't want to display the password in plain text via API or
in the source code of the UI).
For this reason the password was not copy when creating a Template, New
Pool.

Bug-Url: https://bugzilla.redhat.com/1051041
Change-Id: I9206906e3b61551023b21e4358663a4842018c7c
Signed-off-by: Shahar Havivi <shaharh@redhat.com>