Automatic merge from submit-queue

move '(master)' to end of message for uniformity

**What this PR does / why we need it**: This is a small polish operation on the kubernetes charm wrt juju status output.


**Release note**:
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This changes the status output from:

```
kubernetes/0  active    idle   3        172.27.24.54    8088/tcp
Kubernetes running.
kubernetes/1  active    idle   4        172.27.24.55    6443/tcp
(master) Kubernetes services started
```
 to this:
 ```
 kubernetes/0  active    idle   3        172.27.24.54    8088/tcp
 Kubernetes running.
 kubernetes/1  active    idle   4        172.27.24.55    6443/tcp
 Kubernetes services started (master)
 ```