[OpenAFS] GiveUpAllCallBacks callers

[Steve Simmons]

Having read the entire discussion up to this point, I find the alternate =
version 3404 to be an acceptable workaround. There are lots of things in =
various bits of software which look around for condition X to see if Y =
is acceptable. Lacking a proper solution (more on that in a separate =
note), this seems quite reliable.=20

Derrick notes it's dicey software release and engineering; yeah, I =
agree. So let's comment the crap out of it in the code.

Summary: go for it.

Steve