[Fixes #190] Bug: nginx livenessProbe always kill nginx container, when using externalscheme: https

[mwallschlaeger]

Description

this PR fixes an issue when running geonode-k8s with geonode.general.externalScheme. With this configuration the nginx container gets constantly killed as the liveness probes tries to reach http on a wrong port.

Additionally I increased the initialDelaySeconds of the livenessProbe so that it's not failing anymore at the start, while waiting for django to be ready.

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