Merge dynamic replies feature into staging branch #100

Job	Run time
test (14.x)	4m 51s
test-rediscache	5m 5s
test (15.x)	4m 48s
test (16.x)	5m 19s
test-rediscache-contactcache	5m 15s
test-sqlite	4m 6s
	29m 24s

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