npm / cli / #2547 / 1

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chore(refactor): refactor exit handler and tests

 * npm mock logger writes to npm.log.record too now
 * No more extra process.exit from within the process `exit` event handle.
 * No more `exit()` function.  Logic is rolled up into the exit handler.
 * Now there is only an exit handler and an exit event listener.
   `lib/utils/perf.js` was rolled up into npm.js itself.

Unfortunately the tests were written in such a way that any further
refactoring of the exit handler was going to require also rewriting the
tests.  Fortunately NOW the tests are interacting with the exit handler
in a way that shouldn't require them to be rewritten AGAIN if we change
the internals of the exit handler.

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