Automatic merge from submit-queue (batch tested with PRs 60012, 63692, 63977, 63960, 64008). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

pkg: kubelet: remote: increase grpc client default size
Signed-off-by: Antonio Murdaca <runcom@redhat.com>



**What this PR does / why we need it**:

when running lots and lots of containers and having tons of images on a given node, we started seeing this in the logs (with docker):

```
Unable to retrieve pods: rpc error: code = ResourceExhausted desc = grpc: received message larger than max (4208374 vs. 4194304)
```

That's because the grpc client is defaulting to a 4MB response size.
This patch increases the resp size to 8MB to avoid such issue.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
increase grpc client default response size
```