[refactor] remove inline enc/dec from client pool

The whole idea of the encrypter/decrypter pool is to be able to use multiple
cores to allow parallel encryption/decryption. Previous to this commit, the
encryptor/decryptor pools could be configured to not use workers and instead
do encryption/decryption inline. That was meant for testing purposes and
defeated the purpose of the pools.

This commit removes the possibility of inline encrypting/decrypting when using
the pools. It also refactors the enc/dec pool code so any failures while using
the pool are correctly grabbed and raised to the top of the sync deferred
chain.

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