rancher/rancher#37639

• Added option to quiet noisy container logs
  • In other words, some rke operations (such as taking a snapshot and uploading it) produce very few logs, so printing these logs for containers that have a potentially long run time floods the logs and isn't very helpful by itself. Now, for taking a snapshot, the stdout and stderr of the container are only logged when they are different from previous iterations.
• Improved logic to ensure that saving a snapshot is considered successful when at least one snapshot is taken, and at least one node was able to upload to s3. The failures are still logged, however previously this would've resulted in snapshots that failed to upload to s3 being deleted from the node (fixed in rke-tools), so rke has been updated to reflect this. Additionally, rke will now fall back to using the snapshot on the node. This may change if rancher is to separate local and s3 backups for rke1 like rke2, but will have considerations regarding retention (although more than likely we will track retention separately for local/s3 snapshots much like how we are for failed snapshots (Needs Discussion)). There are already considerations regarding the desync between the rancher etcdbackup objects, and the actual backups in both s3 and on the nodes, and a solutation to backpopulate these objects similar to rke2 may actually be desired here in order to minimize the risk of a user restoring an impossible snapshot.
• Renamed IsContainerRunning to DoesContainerExist which is what was previously being checked; added IsContainerRunning for when you really want to make sure a container is running (like etcd before taking a snapshot). There are most likely several places where IsContainerRunning or an equivalent check on a specific container would be useful that checking if it exists (I expect there would likely be some breakages today if some containers were manually stopped), but I considered this out of the scope of this PR because there are already significant changes and identifying which containers would benefit is likely more trouble than it's worth.

Depends on rancher/rke-tools#153 and subsequent KDM update.