Portworx: etcdEndpoints list

[cabrinha]

What this PR does / why we need it:

So many variables defined at the top of templates/storage-cluster.yaml are not necessary. Instead, defaults should be set in values.yaml.

Regarding this piece of helm code:

    endpoints:
      {{- $endpoints := $etcdEndPoints | split ";" }}
      {{- range $key, $val := $endpoints }}
      - {{$val}}
      {{- end }}

It's not necessary to loop over a list, define the $key when it's not used, but instead we can use the with operator

Simply:

    {{- with .Values.etcdEndpoints }}
    endpoints:
      {{- toYaml . | nindent 4 }}
    {{- end }}

Also, having comments in a single line means that if any line is changed in values.yaml, the in-line comment must be re-aligned and spaced/tabbed all over again.

Why not just have comments above what they're referencing?

thisValue: null # This comment must be moved if default is changed

# This comment never needs to be moved
# thatValue is a list
thatValue: []
# - sane defaults
# - foo
# - bar

Which issue(s) this PR fixes (optional)
Closes #

Special notes for your reviewer: