Access and data node configs

[raresfirebolt]

Changes:

• updated values to support separate configs for access node and data node
• updated admin guide to reflect the changes in config setup

[CLAassistant]

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3 out of 4 committers have signed the CLA.

✅ mjeffin
✅ feikesteenbergen
✅ raresfirebolt
❌ EladDolev
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