logging: remove reference to non-existent augeas files
    
    The libvirt_logd.aug and test_libvirt_logd.aug.in files
    have never existed so shouldn't be in EXTRA_DIST. It was
    a copy+paste mistake when closing virtlogd from virtlockd
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>