Auto merge of #1357 - semarie:openbsd-pfstatus, r=gnzlbg

openbsd: add KERN_PFSTATUS and update KERN_MAXID

`KERN_PFSTATUS` has been recently added, and so `KERN_MAX` value has changed.
Add it to avoid failure on (local) ci.

While here, I added few blank lines to separated series of constants.