Summary: this test has been seen failing on Solaris 10, presumably because it was run as root. The fix will skip the non-writable case if it can't make a non-writable dir.
Reviewed-by: mchung

Summary: Failure to delete test log file should be a warning instead of test failure
Reviewed-by: mduigou, smarks

Reviewed-by: alanb

Reviewed-by: alanb