Mark get{,e,res}{u,g}id() and getgroups() as NOLOCK

A little while back, guenther moved user credentials to a per-process
property, but also kept a per-thread cache that would remain stable
for the duration of a thread's system call.  These system calls now
only access the thread's cached credentials, so they're safe to run
without the kernel lock.

ok kettenis, guenther

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