Commits on Mar 1, 2021

1. MAISTRA-2149: Make IOR robust in multiple replicas …

   In scenarios where multiple replicas of istiod are running,
   only one IOR should be in charge of keeping routes in sync
   with Istio Gateways. We achieve this by making sure IOR only
   runs in the leader replica.
   
   Also, because leader election is not 100% acurate, meaning
   that for a small window of time there might be two instances
   being the leader - which could lead to duplicated routes
   being created if a new gateway is created in that time frame -
   we also change the way the Route name is created: Instead of
   having a generateName field, we now explicitly pass a name to
   the Route object to be created. Being deterministic, it allows
   the Route creation to fail when there's already a Route object
   with the same name (created by the other leader in that time frame).
   
   Use an exclusive leader ID for IOR
   
   Manual cherrypick of maistra#275

   

   jwendell committed Mar 1, 2021
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