please upgrade vendored consul

[onlyjob]

At the moment Nomad only builds against Consul 1.4.*.
Nomad FTBFS with Consul 1.5+ because github.com/hashicorp/consul/lib/freeport has been moved to github.com/hashicorp/consul/sdk/freeport.

Furthermore Consul 1.5.3 introduced breaking change to github.com/hashicorp/consul/agent/consul/autopilot that causes the following FTBFS:

src/github.com/hashicorp/nomad/nomad/server_setup_oss.go:15:62: cannot use apDelegate (type *AutopilotDelegate) as type autopilot.Delegate in argument to autopilot.NewAutopilot:
        *AutopilotDelegate does not implement autopilot.Delegate (missing SerfLAN method)

Please consider upgrading vendored Consul.

Thanks.

[onlyjob]

This commit is responsible for FTBFS against Consul 1.5.3: hashicorp/consul@f09af53

[onlyjob]

FYI @tgross. Due to this issue I can not upgrade Consul v1.5.2 in Debian... Thanks.

[onlyjob]

A first fallout of this problem: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950736

Consul is affected by CVE-2020-7219 and CVE-2020-7955 but I can not upgrade Consul in Debian because it will break Nomad. :((

How can I convince you to care more about interoperability, integration and consistency between your own software components?

CC: @tgross.

[tgross]

As previously discussed, we'll be doing this vendor upgrade in the 0.11 timeframe.

[onlyjob]

Thanks.

[onlyjob]

Thanks, @notnoop. Few commits from #7171 is all that was needed. Very helpful.

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