MFC r282211,r282244:

r282211:

ATF_REQUIRE_KERNEL_MODULE: use atf_skip, not ATF_REQUIRE_MSG so the testcase
no longer bombs out
PLAIN_REQUIRE_KERNEL_MODULE: use printf + _exit, no err so the testcase no
longer bombs out if it prints to stderr

r282244:

Fix typo. It should have been atf_tc_skip, not atf_skip

Reported by: many, Jenkins
Pointyhat to: ngie