- Add a new flag MTX_QUIET that can be passed to the various mtx_*

  functions.  If this flag is set, then no KTR log messages are issued.
  This is useful for blocking excessive logging, such as with the internal
  mutex used by the witness code.
- Use MTX_QUIET on all of the mtx_enter/exit operations on the internal
  mutex used by the witness code.
- If we are in a panic, don't do witness checks in witness_enter(),
  witness_exit(), and witness_try_enter(), just return.

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