Add issues section for 17.0
What does this MR do and why?
Add issues section for upgrades from 17.0 and below
It seems that having grafana settings when upgrading from 17.0 to 17.1 breaks the MR widget. There is a note of the issue for 16.11, but different symptoms. I don't know how the customer managed this without seeing reconfigure issues in 17.0.
- ZD ticket: https://gitlab.zendesk.com/agent/tickets/619701
- Issue change: omnibus-gitlab#8200 (closed)
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