snf-cyclades-app: Use the new AstakosClient
Change AstakosClient to use ASTAKOS_AUTH_URL as entry point to the Astakos service, instead of ASTAKOS_BASE_URL it was using until now. Remove ASTAKOS_BASE_URL from Cyclades settings, replace it with ASTAKOS_AUTH_URL. Modify Cyclades to determine ASTAKOS_ACCOUNT_URL and ASTAKOS_UI_URL with calls to astakosclient.
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