Merge pull request #42060 from marcoceppi/juju-owners

Automatic merge from submit-queue

Update owners file to reflect Juju/Charm knowledgable reviewers

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

Several reviewers have expressed confusion on why they're being added to pull requests related to cluster/juju. This is likely because the cluster OWNER wasn't updated from the original when created. This removes those who have expressed confusion to avoid noise in future updates to this directory.

Removed:
 - @pmorie [ref](https://github.com/kubernetes/kubernetes/pull/40814#issuecomment-282107925)
 - @jsafrane [ref](https://github.com/kubernetes/kubernetes/pull/42007#issuecomment-282246574)

Added:
 - @marcoceppi
 - @chuckbutler 
 - @mbruzek  

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

cluster/juju/OWNERS

@@ -4,13 +4,14 @@ approvers:
 - marcoceppi
 - mbruzek
 reviewers:
+- chuckbutler
+- marcoceppi
+- mbruzek
 - thockin
 - mikedanese
 - nikhiljindal
-- pmorie
 - eparis
 - jlowdermilk
-- jsafrane
 - krousey
 - david-mcmahon
 - Cynerva