tests: fix hexdump for big endian

For now endianess dependent subtests have undefined output on
BE systems until sombody re-checks this and provides expected
output files with .BE suffix.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests: ipcs/limits2 is known to fail

See github issue #51, comment 2
https://github.com/karelzak/util-linux/issues/51

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests: script/race would work with variable loop count

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests, script/race is known to fail

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>