libcryptsetup-rs global mutex can block key presence verification

[jbaublitz]

We need to do verification in stratisd that the key is in the keyring before we do any cryptsetup operations. If another long-running encryption operation is occurring, it will block stratisd from reporting that the key is not in the keyring.

[mulkieran]

I believe that this will be resolved by the encryption PR currently in review.

[jbaublitz]

That is correct.