fix: remove using fqdn with .cluster.local

[darkn3rd]

This removes references to the FQDN with domain name of cluster.local, for example:

• BEFORE: myrelease-dgraph-zero-0.myrelease-dgraph-zero-headless.default.svc.cluster.local
• AFTER: myrelease-dgraph-zero-0.myrelease-dgraph-zero-headless.default.svc

This fixes a few scenarios:

• Local clusters, such as microk8s, where a domain name is not used.
• Alternative internal DNS schemes where default cluster.local is not use
  • https://discuss.dgraph.io/t/helm-chart-defaults-to-cluster-local/8269/3

This works because the resolver should always have cluster.lcoal or equivalent alternative domain name. For example, on GKE, these search domains will be configured:

• default.svc.cluster.local
• svc.cluster.local
• cluster.local
• c.${PROJECT_ID}.internal
• google.internal

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This change is 

[danielmai]

Add a comment, and then

Reviewed 4 of 4 files at r1, 1 of 1 files at r2.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @darkn3rd)

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charts/dgraph/templates/alpha/statefulset.yaml, line 160 at r2 (raw file):

| awk '{gsub(/\.$/,""); print $0}'

Is this still needed once dgraph-io/dgraph#6837 merged? Can you add a comment explaining why this is needed and a TODO to remove this later?

[darkn3rd]

Reviewable status: 4 of 5 files reviewed, 1 unresolved discussion (waiting on @danielmai)

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charts/dgraph/templates/alpha/statefulset.yaml, line 160 at r2 (raw file):

Previously, danielmai (Daniel Mai) wrote…

| awk '{gsub(/\.$/,""); print $0}'

Is this still needed once dgraph-io/dgraph#6837 merged? Can you add a comment explaining why this is needed and a TODO to remove this later?

done