* Add ability to migrate autoseal to autoseal
This adds the ability to migrate from shamir to autoseal, autoseal to
shamir, or autoseal to autoseal, by allowing multiple seal stanzas. A
disabled stanza will be used as the config being migrated from; this can
also be used to provide an unwrap seal on ent over multiple unseals.
A new test is added to ensure that autoseal to autoseal works as
expected.
* Fix test
* Provide default shamir info if not given in config
* Linting feedback
* Remove context var that isn't used
* Don't run auto unseal watcher when in migration, and move SetCores to SetSealsForMigration func
* Slight logic cleanup
* Fix test build and fix bug
* Updates
* remove GetRecoveryKey function
Jeff Mitchell