Add plugin version to GRPC interface
Added a version interface in the sdk/logical so that it can be shared between all plugin types, and then wired it up to RunningVersion in the mounts, auth list, and database systems.
I've tested that this works with auth, database, and secrets plugin types, with the following logic to populate RunningVersion:
If a plugin has a PluginVersion() method implemented, then that is used
If not, and the plugin is built into the Vault binary, then the go.mod version is used
Otherwise, the it will be the empty string.
My apologies for the length of this PR.
* Placeholder backend should be external
We use a placeholder backend (previously a framework.Backend) before a
GRPC plugin is lazy-loaded. This makes us later think the plugin is a
builtin plugin.
So we added a `placeholderBackend` type that overrides the
`IsExternal()` method so that later we know that the plugin is external,
and don't give it a default builtin version.
* upgrade aws roles
* test upgrade aws roles
* Initialize aws credential backend at mount time
* add a TODO
* create end-to-end test for builtin/credential/aws
* fix bug in initializer
* improve comments
* add Initialize() to logical.Backend
* use Initialize() in Core.enableCredentialInternal()
* use InitializeRequest to call Initialize()
* improve unit testing for framework.Backend
* call logical.Backend.Initialize() from all of the places that it needs to be called.
* implement backend.proto changes for logical.Backend.Initialize()
* persist current role storage version when upgrading aws roles
* format comments correctly
* improve comments
* use postUnseal funcs to initialize backends
* simplify test suite
* improve test suite
* simplify logic in aws role upgrade
* simplify aws credential initialization logic
* simplify logic in aws role upgrade
* use the core's activeContext for initialization
* refactor builtin/plugin/Backend
* use a goroutine to upgrade the aws roles
* misc improvements and cleanup
* do not run AWS role upgrade on DR Secondary
* always call logical.Backend.Initialize() when loading a plugin.
* improve comments
* on standbys and DR secondaries we do not want to run any kind of upgrade logic
* fix awsVersion struct
* clarify aws version upgrade
* make the upgrade logic for aws auth more explicit
* aws upgrade is now called from a switch
* fix fallthrough bug
* simplify logic
* simplify logic
* rename things
* introduce currentAwsVersion const to track aws version
* improve comments
* rearrange things once more
* conglomerate things into one function
* stub out aws auth initialize e2e test
* improve aws auth initialize e2e test
* finish aws auth initialize e2e test
* tinker with aws auth initialize e2e test
* tinker with aws auth initialize e2e test
* tinker with aws auth initialize e2e test
* fix typo in test suite
* simplify logic a tad
* rearrange assignment
* Fix a few lifecycle related issues in #7025 (#7075)
* Fix panic when plugin fails to load
