ipatests: Use healthcheck namespacing in stopped server test
    
    The test_run_with_stopped_master() test runs ipactl stop
    and then verifies that all the errors relate to the services
    not being available. The newly integrated PKI tests also
    report errors in this case.
    
    Use the namespacing introduced in freeipa-healthcheck-0.6
    to limit the execution to the ipahealthcheck.meta checks
    to avoid the spurious PKI errors.
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Francois Cami <fcami@redhat.com>