change arguments to suser. suser now takes the process, and a flags

argument.  old cred only calls user suser_ucred.  this will allow future
work to more flexibly implement the idea of a root process.  looks like
something i saw in freebsd, but a little different.
use of suser_ucred vs suser in file system code should be looked at again,
for the moment semantics remain unchanged.
review and input from art@  testing and further review miod@

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