make sure --skip-existing-hooks option could work in ovirt-node-upgrade

Primary the value of _options.skip_existing_hooks always "False" whether
add --skip-existing-hooks option or not when using ovirt-node-upgrade.
Now fix it as the value of _options.skip_existing_hooks was "True" when
add --skip-existing-hooks option. If not add it, the default value was
"False"

Change-Id: Ia71b8478ca191f41f99192a6e8f3083ba5deef9c
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1107549
Signed-off-by: hadong <hadong@redhat.com>
Netconsole model tweaks

Don't use persistence from the old codebase.
Set a default port if there isn't one.

Change-Id: Ifaf0faa9c62e50c5d57727d3284199807df6427e
Signed-off-by: Ryan Barry <rbarry@redhat.com>