cam: Dtrace scripts to help diagnose weird things

These are sample dtrace scripts that likely need to be modified for
whatever problem you are chasing. Unfortuneately, you have to read the
driver ex

cam: Dtrace scripts to help diagnose weird things

These are sample dtrace scripts that likely need to be modified for
whatever problem you are chasing. Unfortuneately, you have to read the
driver extensively to understand them or how to use them. But studying
the completion routine of mpr/mps will help understand many of the error
and recovery paths.

Sponsored by: Netflix

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tools/cam: Start to add the testing tools for CAM

Create a directory for testing tools arond CAM. These are snippets of
what will eventually be camio. At the moment, it was written using fbt
traces.

tools/cam: Start to add the testing tools for CAM

Create a directory for testing tools arond CAM. These are snippets of
what will eventually be camio. At the moment, it was written using fbt
traces. This is OK, but fragile, so they need to be re-written with the
cam provider. cam_all_but_scsi.d is the first step. It shows how to do
this with the new cam dtrace provider.

Sponsored by: Netflix
Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D54472

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