Display information about "locked pools" by a regular CLI command

[mulkieran]

Something like:

> stratis <subcommand> list locked
Pool UUID      Number of Devnodes   Encryption Info
---------------     ----------------------------   --------------------
<UUID>          1024                             Clevis

maybe.

[mulkieran]

@drckeefe Assigning to you for comment

[mulkieran]

This may tie into our 3.0.0 bump and removing old D-Bus API bits.

[mulkieran]

Shortly we will be exporting the information about the locked pools in a slighly more complicate fashion, we can wait until then.

[mulkieran]

We plan to export this locked pools information as a single, very structured D-Bus property. We may still be able to make use of that property in the CLI.

[drckeefe]

This output would be useful

[mulkieran]

Better to wait until stopping and starting pools is done, as D-Bus API may change a bit.

[mulkieran]

This will be part of the release after 3.1.0.

[mulkieran]

We will actually do it as part of 3.1.0 and stop/start pools.