[Jaeger] fix .allinone.replicas helm value

[micolun]

This PR fixes the bug created after PR#494 when helm chart value .allInOne.replicas is 0 but the deployment is still set to 1.

When the below if statement is computed for replicas: 0, the result is false and as a consequence the deployment manifest doesn't contain replicas field, which in turn forces it to use the default value, which is 1.

spec:
  {{- if .Values.allInOne.replicas }}
  replicas: {{ .Values.allInOne.replicas }}
  {{- end }}

• fixes # Rather than checking value of replicas, we can check if .allInOne.replicas key has been declared. This would create a deployment with the specified number of replicas in the values file.

Checklist

• DCO signed
• Commits are GPG signed
• Chart Version bumped
• Title of the PR starts with chart name ([jaeger] or [jaeger-operator])
• README.md has been updated to match version/contain new values

[pavelnikolov]

@Mihail-blip not all commit have been signed. Could you, please, squash all the two commits into one and sign them?

[micolun]

One of my first contributions, I accidentally closed the PR.
Think I managed to gpg sign the commits, please review

[pavelnikolov]

The PR is still not DCO signed. Thank you for reporting.
Fixed in 28ab98b