* cannon: Port go map tests

* cannon: Port pool_test.go

* cannon: Port a few more mutex tests

* cannon: Port waitgroup_test.go

* cannon: Port oncefunc_test.go (in progress)

* cannon: Port atomic_test.go (in progress)

* cannon: Port value_test.go (in progress)

* cannon: Fix atomic tests by using a test mock

* cannon: Fix test fail behavior

* cannon: Move test util to a shared module

* cannon: Use common testutil throughout

* cannon: Fix failing tests

* cannon: Add sanity check test program for test runner utils

* cannon: Add more util tests, fix step counts

* cannon: Rename test util method

* cannon: Fix panic, error handling in testutil

* cannon: Dedupe test running code

* cannon: Simplify testutil interface

* cannon: Mark mt tests as slow

* cannon: Cut debugging code from test

* cannon: Validate gc complete output

* cannon: Synchronize access to bool values