Redmine #2693: some 10_files tests check for unpromised gid numbers

Some platforms, such as HP-UX, do not have root's primary group as gid 0. Certain tests expect a string showing mode, nlinks, uid, gid, and size to show a uid and gid of zero for the test file, but without promising the GID the file defaults to root's primary group. On HP-UX this is 3 (sys), causing the test to fail.

The tests have been updated to promise the same mode, uid, and gid that are expected in the "expect" string for the test file that is checked by the printf statement.