K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2015-03-21T20:24:54.308686Z
K 7
svn:log
V 284
cred: add proc_set_cred_init helper

proc_set_cred_init can be used to set first credentials of a new
process.

Update proc_set_cred assertions so that it only expects already used
processes.

This fixes panics where p_ucred of a new process happens to be non-NULL.

Reviewed by:	kib

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