Update go-blip in the 2.1 manifest (#4063)
Update go-blip in the 2.1 manifest (#4063)

Picks up the go-blip changes on the go-blip sync_gateway-2.1.x branch.
ceejatec/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,ceejatec/sync_gateway,ceejatec/sync_gateway,ceejatec/sync_gateway,couchbaselabs/sync_gateway