xinetd_tests.sh: remove RECORD and eliminate "|| RC=$?"
1) In xinetd.conf, `RECORD' is not a valid value for entry `log_on_failure'
(I couldn't find a distro in which it's valid), and it makes xinetd
successfully starts and promptly exit with error message:
"Bad log_on_failure flag: RECORD [file=/etc/xinetd.conf][line=6]",
but the test will pass because telnet service is not started and that's
what it expect.
2) Eliminate '|| RC=$?' because because it may not be excecuted and the
original value in RC can mess things up. Also remove the RC=0
initializations that are now unnecessary.