env: add EnvMirror
This is an Env implementation that mirrors all storage-related methods on
two different backend Env's and verifies that they return the same
results (return status and read results). This is useful for implementing
a new Env and verifying its correctness.
Signed-off-by: NSage Weil <sage@redhat.com>
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utilities/env_mirror.cc
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utilities/env_mirror_test.cc
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