lib/cloner.c: add more args

add args with ptid and ctid in ltp_clone().

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Acked-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
clone/clone08.c: add new tests

Add new tests for clone(2):
CLONE_PARENT
CLONE_CHILD_SETTID
CLONE_PARENT_SETTID
CLONE_STOPPED
CLONE_THREAD

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Reviewed-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>