Add autotests for export calendar

core/autotests/calendar/data/export/calendarconfigandresources/config/akonadi/agent_config_akonadi_davgroupware_resource_0

+[Agent]
+Name=caldav

core/autotests/calendar/data/export/calendarconfigandresources/config/akonadi_davgroupware_resource_0rc

+[General]
+defaultUsername=kde
+displayName=caldav
+remoteUrls=$default$|CalDav|https://caldav.kde.com/
+settingsVersion=3

core/autotests/calendar/data/export/calendarconfigandresources/list.txt

+calendar/akonadi_davgroupware_resource_0/agent_config_akonadi_davgroupware_resource_0
+calendar/akonadi_davgroupware_resource_0/akonadi_davgroupware_resource_0rc
 calendar/akonadi_ical_resource_2/agent_config_akonadi_ical_resource_2
 calendar/akonadi_ical_resource_2/akonadi_ical_resource_2rc
 calendar/akonadi_ical_resource_2/std.ics

core/autotests/calendar/data/export/calendarconfigandresources/references/calendar/akonadi_davgroupware_resource_0/agent_config_akonadi_davgroupware_resource_0

+[Agent]
+Name=caldav

core/autotests/calendar/data/export/calendarconfigandresources/references/calendar/akonadi_davgroupware_resource_0/akonadi_davgroupware_resource_0rc

+[General]
+defaultUsername=kde
+displayName=caldav
+remoteUrls=$default$|CalDav|https://caldav.kde.com/
+settingsVersion=3

core/autotests/calendar/exportcalendarsjobinterfacetest.cpp

@@ -40,6 +40,8 @@ void ExportCalendarsJobInterfaceTest::exportCalendar()
     lstInfo << info;
     info.identifier = QStringLiteral("akonadi_ical_resource_2");
     lstInfo << info;
+    info.identifier = QStringLiteral("akonadi_davgroupware_resource_0");
+    lstInfo << info;
     //Add extra resource.
     info.identifier = QStringLiteral("akonadi_contacts_resource_1");
     lstInfo << info;