Remove long time unused CREDITS file.

Last update was in 2007 and it does not reflect current situation.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Remove README.ltp-devel.in and ltp-devel.spec.in

The ltp-deve.spec.in was not update for some time and does not reflect
current situation.

The same goes for README.ltp-devel.in.

This also removes the package target from main Makefile which depended
on the specfile.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Update README.

Split README into README and README.kernel_config and update README
content to match current state.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>