Add 'clear' command

We currently unconditionally use gpg-agent to enter the PIN to use when
opening the encrypted volume. The agent has the advantage of caching the
password for us so that subsequent invocations against the same cache
entry can be served without user interaction.
For various reasons, however, it can be desirable to have the ability to
remove this entry from the cache. This change introduces a new command
'clear' that achieves precisely this task.

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