Rename `crucible-dtrace` package to `crucible-utils`

[leftwo]

@leftwo maybe we should rename it crucible-utils instead of crucible-dtrace?

Originally posted by @mkeeter in #1800 (comment)

We are planning to put more into this package/directory so why not change the name
to reflect the updated contents.

[leftwo]

This change landed in commit 3b6819c