update testcases to use flag for get_allowed_nodes()

Interface of get_allowed_nodes() now requires a flag,
update all testcases using this interface.

Also fix some checkpatch warnings.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Caspar Zhang <caspar@casparzhang.com>
Reviewed-by: Zhouping Liu <zliu@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
13 files changed