Increase storage and set sysctls in Scylla Helm chart

[rzetelskik]

Description of your changes: Currently deploying a Scylla Helm chart with predefined values results in an error (see #906). This PR increases the storage capacity in values.yaml. To mitigate further errors, it also sets sysctls.

Which issue is resolved by this Pull Request: Resolves #906

[Choraden]

Shouldn't we also set sysctls in scylla cluster for e2e tests?

[tnozicka]

in CI / e2e sysctls are tuned for the nodes, I think that's where we should direct this in general but the automatic node sysctl tuning didn't land yet.

[scylla-operator-bot[bot]]

@rzetelskik: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-gke	f6297c9a989559423bf2655d70da20026c9c7fc2	link	true	/test e2e-gke

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[rzetelskik]

Closing as stale