Remove v3 api form SSA

Remove the usage of the ovirt gem and version 3 api from the SSA

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1535782

app/models/manageiq/providers/redhat/infra_manager/vm_or_template_shared/scanning.rb

@@ -151,7 +151,7 @@ def connect_to_ems(ost)
     $log.info "#{log_header}: Connecting to [#{ems_display_text}] for VM:[#{@vm_cfg_file}]"
 
     begin
-      ost.miqRhevm = ext_management_system.rhevm_inventory(:force_v3 => true)
+      ost.miqRhevm = ManageIQ::Providers::Redhat::Inventory::Collector.new(ext_management_system, nil)
       $log.info "Connection to [#{ems_display_text}] completed for VM:[#{@vm_cfg_file}] in [#{Time.now - st}] seconds"
     rescue Timeout::Error => err
       msg = "#{log_header}: Connection to [#{ems_display_text}] timed out for VM:[#{@vm_cfg_file}] with error [#{err}] after [#{Time.now - st}] seconds"

app/models/manageiq/providers/redhat/inventory/collector.rb

@@ -157,4 +157,40 @@ def collect_dc_domains(dc)
       connection.follow_link(dc.storage_domains)
     end
   end
+
+  def collect_vm_disks(vm)
+    manager.with_provider_connection(VERSION_HASH) do |connection|
+      disk_attachments = connection.follow_link(vm.disk_attachments)
+      disk_attachments.collect do |disk_attachment|
+        connection.follow_link(disk_attachment.disk)
+      end
+    end
+  end
+
+  def vm_or_template_by_path(path)
+    uuid = ::File.basename(path, '.*')
+    vm      = vm_by_uuid(uuid)
+    vm      = template_by_uuid(uuid) if vm.blank?
+    vm
+  end
+
+  def vm_by_uuid(uuid)
+    manager.with_provider_connection(VERSION_HASH) do |connection|
+      begin
+        connection.system_service.vms_service.vm_service(uuid).get
+      rescue OvirtSDK4::Error # when 404
+        nil
+      end
+    end
+  end
+
+  def template_by_uuid(uuid)
+    manager.with_provider_connection(VERSION_HASH) do |connection|
+      begin
+        connection.system_service.templates_service.template_service(uuid).get
+      rescue OvirtSDK4::Error # when 404
+        nil
+      end
+    end
+  end
 end