Commits on Oct 13, 2020

1. consul/connect: dynamically select envoy sidecar at runtime …

   As newer versions of Consul are released, the minimum version of Envoy
   it supports as a sidecar proxy also gets bumped. Starting with the upcoming
   Consul v1.9.X series, Envoy v1.11.X will no longer be supported. Current
   versions of Nomad hardcode a version of Envoy v1.11.2 to be used as the
   default implementation of Connect sidecar proxy.
   
   This PR introduces a change such that each Nomad Client will query its
   local Consul for a list of Envoy proxies that it supports (hashicorp/consul#8545)
   and then launch the Connect sidecar proxy task using the latest supported version
   of Envoy. If the `SupportedProxies` API component is not available from
   Consul, Nomad will fallback to the old version of Envoy supported by old
   versions of Consul.
   
   Setting the meta configuration option `meta.connect.sidecar_image` or
   setting the `connect.sidecar_task` stanza will take precedence as is
   the current behavior for sidecar proxies.
   
   Setting the meta configuration option `meta.connect.gateway_image`
   will take precedence as is the current behavior for connect gateways.
   
   `meta.connect.sidecar_image` and `meta.connect.gateway_image` may make
   use of the special `${NOMAD_envoy_version}` variable interpolation, which
   resolves to the newest version of Envoy supported by the Consul agent.
   
   Addresses #8585 #7665

   

   shoenig committed Oct 13, 2020
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