ui: Changing foreman provider data loading

When selected new provider the addHost external provider form fields will
be cleaned and blocked till all provider's info will be loaded.
In this patch we also change the update method which now retrieves all
provider's info in each call, instead of loading only part of the
information.

Change-Id: Ie01a6c8b6d6f7e58a6057fc211ab5e4605bbe310
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
core: add host_provider_id to vdsStatic

This allows to sign the provider id, which in hosts mostly foreman
server id that added as external provider. With saving the ID we'll be
able to gather more info about the host later on.

Change-Id: Icced7dda43fee83aa904a068cff48b1fd3da4b76
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1113003
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>