Added functionality: ability to keep group and user when importing re…

…port.

There is 'Preserve owner' checkbox added on Import report page, UI PR: ManageIQ/manageiq-ui-classic#5060
This checkbox controls if report will be imported in the old way: unconditionally override user_id and miq_group_id fields of imported report,
OR in the new way: keep those fields untouched.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1638533

app/models/miq_report/import_export.rb

@@ -36,7 +36,7 @@ def import_from_hash(report, options = nil)
       report[:db_options].deep_symbolize_keys! if report[:db_options]
 
       user = options[:user] || User.find_by_userid(options[:userid])
-      report.merge!("miq_group_id" => user.current_group_id, "user_id" => user.id)
+      report.merge!("miq_group_id" => user.current_group_id, "user_id" => user.id) unless options[:preserve_owner]
 
       report["name"] = report.delete("menu_name")
       rep = MiqReport.find_by(:name => report["name"])