coreutils: split out coreutils-getlimits

coreutils: split out coreutils-getlimits

Previously, the noinst_PROGRAM getlimits is put in coreutils-ptest
package in order to execute the ptest. However, this command might
also be needed by other ptest packages. As an example, findutils
4.10.0 ptest pacakge would need this command. So we split it out
into a new package.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>