Issue 312: list PVC with ZookeeperCluster uid

[srteam2020]

Change log description

Add UID as a label for each PVC in MakeStatefulSet and list PVC using the UID in getPVCList.

Purpose of the change

Fix #312.

What the code does

• MakeStatefulSet: One more label, uid, when creating VolumeClaimTemplates
• getPVCList: List the PVC with the uid of the current ZookeeperCluster

How to verify it

• Normal PVC creation/deletion without node failures can still work
• As described in [BUG] PVC can be mistakenly deleted when reading from stale apiserver #312, the reproduction steps will not trigger PVC deletion

[codecov-io]

Codecov Report

Merging #313 (a687e91) into master (cda03d2) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #313   +/-   ##
=======================================
  Coverage   84.64%   84.64%           
=======================================
  Files          11       11           
  Lines        1309     1309           
=======================================
  Hits         1108     1108           
  Misses        133      133           
  Partials       68       68           

Impacted Files	Coverage Δ
...er/zookeepercluster/zookeepercluster_controller.go	60.67% <100.00%> (ø)
pkg/zk/generators.go	99.27% <100.00%> (ø)

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[anishakj]

LGTM