K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2020-11-17T20:01:21.224629Z
K 7
svn:log
V 386
unix(4): Enhance LOCAL_CREDS_PERSISTENT ABI

As this ABI is still fresh (r367287), let's correct some mistakes now:

- Version the structure to allow for future changes
- Include sender's pid in control message structure
- Use a distinct control message type from the cmsgcred / sockcred mess

Discussed with:	kib, markj, trasz
Differential Revision:	https://reviews.freebsd.org/D27084

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