mkernel

oomtest_setup : make oomtest_*_postinit active, set soft rlimit but not hard rlimit
oomtest_reset : make oomtest_*_preinit active, reset soft rlimit to hard rlimit
oomtest_begin_preinit : noop
oomtest_begin_postinit : actual memory fill
oomtest_end_preinit : noop
oomtest_end_postinit : actual memory free

use oomtest_setup in checked_*_oom_setup (in child process if forking enabled)
use oomtest_reset in checked_*_oom_teardown (in child process if forking enabled)

Thus, the main process, testsuites and testcases are not limited by default, only oom testcases with the relevant checked fixtures