setup: avoid restart and destroy VM options at the add_host plugin
setup: avoid restart and destroy VM options at the add_host plugin

Restart and destroy VM options make sense only if on the first
host and at initial stages.
If already at add_host plugin we have simply to add the host to the
engine.
So:
- reordering options cause only 1 and 2 are always significative
- avoiding options 3  and 4 if already at add_host

Change-Id: I8d57245ccfc5c1f66bf03699acb3f197c9068ff1
Bug-Url: https://bugzilla.redhat.com/1271511
Signed-off-by: Simone Tiraboschi <cb03129c66ba4da7ba7044049d0f43907bf857bb@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup