cri: ensure NRI API never has nil CRI

A nil CRIImplementation field can cause a nil pointer dereference and
panic during startup recovery.

Prior to this change, the nri.API struct would have a nil cri
(CRIImplementation) field after nri.NewAPI until nri.Register was
called.  Register is called mid-way through initialization of the CRI
plugin, but recovery for containers occurs prior to that.  Container
recovery includes establishing new exit monitors for existing containers
that were discovered.  When a container exits, NRI plugins are given the
opportunity to be notified about the lifecycle event, and this is done
by accessing that CRIImplementation field inside the nri.API.  If a
container exits prior to nri.Register being called, access to the
CRIImplementation field can cause a panic.

Here's the call-path:

* The CRI plugin starts running
  [here](ae71819c4f/pkg/cri/server/service.go (L222))
* It then [calls into](ae71819c4f/pkg/cri/server/service.go (L227))
  `recover()` to recover state from previous runs of containerd
* `recover()` then attempts to recover all containers through
  [`loadContainer()`](ae7d74b9e2/internal/cri/server/restart.go (L175))
* When `loadContainer()` finds a container that is still running, it waits
  for the task (internal containerd object) to exit and sets up
  [exit monitoring](ae7d74b9e2/internal/cri/server/restart.go (L391))
* Any exit that then happens must be
  [handled](ae7d74b9e2/internal/cri/server/events.go (L145))
* Handling an exit includes
  [deleting the Task](ae7d74b9e2/internal/cri/server/events.go (L188))
  and specifying [`nri.WithContainerExit`](ae7d74b9e2/internal/cri/nri/nri_api_linux.go (L348))
  to [notify](ae7d74b9e2/internal/cri/nri/nri_api_linux.go (L356))
  any subscribed NRI plugins
* NRI plugins need to know information about the pod (not just the sandbox),
  so before a plugin is notified the NRI API package
  [queries the Sandbox Store](ae7d74b9e2/internal/cri/nri/nri_api_linux.go (L232))
  through the CRI implementation
* The `cri` implementation member field in the `nri.API` struct is set as part of the
  [`Register()`](ae7d74b9e2/internal/cri/nri/nri_api_linux.go (L66)) method
* The `nri.Register()` method is only called
  [much further down in the CRI `Run()` method](ae71819c4f/pkg/cri/server/service.go (L279))

Signed-off-by: Samuel Karp <samuelkarp@google.com>

internal/nri/nri.go

@@ -38,7 +38,7 @@ type API interface {
 	// IsEnabled returns true if the NRI interface is enabled and initialized.
 	IsEnabled() bool
 
-	// Start start the NRI interface, allowing external NRI plugins to
+	// Start starts the NRI interface, allowing external NRI plugins to
 	// connect, register, and hook themselves into the lifecycle events
 	// of pods and containers.
 	Start() error