Support for IdP AIuthentication [Do not merge yet - Feedback requested] #320

Job	Run time
Run unit tests	1m 3s
Run e2e tests (couchdb:3, search,nonpartitioned,couchdb-v2-only)	15m 12s
Run e2e tests (couchdb:2.3.1, search,partitioned)	14m 56s
	31m 11s

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