There's a (somewhat) common case we can get into where the node
status update loop is busy while a provider is trying to send
a node status update. Right now, we block the provider from
creating a notification in this case.
If the ping timer is being used, it should be reset with the ping update
interval. If the status update interval is used then Ping stops being
called for long enough to cause kubernetes to mark the node as NotReady.
* Move tracing exporter registration
This doesn't belong in the library and should be configured by the
consumer of the opencensus package.
* Rename `vkublet` package to `node`
`vkubelet` does not convey any information to the consumers of the
package.
Really it would be nice to move this package to the root of the repo,
but then you wind up with... interesting... import semantics due to the
repo name... and after thinking about it some, a subpackage is really
not so bad as long as it has a name that convey's some information.
`node` was chosen since this package deals with all the semantics of
operating a node in Kubernetes.
