Update consul-template to v0.25.1

[fredrikhgrelland]

While working on #8849 I needed consul namespace support in consul-template.

Inclusive language changes required some refactoring, but is kept backwards compatible.

[tgross]

Hi @fredrikhgrelland! Thanks so much for this PR, especially for pulling out the consul-template change from the large PR you're working on.

---

This isn't a blocker but would help testing: to test backwards compatibility, I ran a job on a build from master, then built this PR and restarted Nomad. Unfortunately I got a panic when restarting Nomad with the new build (see below). If I wipe out the data dir and run with this build, it works fine. And when I rebased this PR on master the problem and started over from scratch the problem went away... there's probably something that landed on master that you don't have in your branch that's breaking raft entries, so if you were to rebase from master that would make it easier to test this out. Thanks!

Started Nomad.
==> WARNING: Bootstrap mode enabled! Potentially unsafe operation.
==> Loaded configuration from /etc/nomad.d/standalone.hcl
==> Starting Nomad agent...
panic: failed to apply request: []byte{0x48, 0x81, 0xaa, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x54, 0x69, 0x6d, 0x65, 0xd3, 0x16, 0x39, 0xdd, 0xcf, 0x8d, 0x5b, 0xd7, 0xf9}
goroutine 16 [running]:
github.com/hashicorp/nomad/nomad.(*nomadFSM).Apply(0xc0002d73b0, 0xc0005d0aa0, 0x4f8ad20, 0xbfd590b12b50cc03)
        github.com/hashicorp/nomad/nomad/fsm.go:292 +0x193b
github.com/hashicorp/raft.(*Raft).runFSM.func1(0xc00007cac0)
        github.com/hashicorp/raft@v1.1.3-0.20200211192230-365023de17e6/fsm.go:90 +0x2c1
github.com/hashicorp/raft.(*Raft).runFSM.func2(0xc000212000, 0x33, 0x40)
        github.com/hashicorp/raft@v1.1.3-0.20200211192230-365023de17e6/fsm.go:113 +0x75
github.com/hashicorp/raft.(*Raft).runFSM(0xc0005f4000)
        github.com/hashicorp/raft@v1.1.3-0.20200211192230-365023de17e6/fsm.go:219 +0x42f
github.com/hashicorp/raft.(*raftState).goFunc.func1(0xc0005f4000, 0xc0003d6c00)
        github.com/hashicorp/raft@v1.1.3-0.20200211192230-365023de17e6/state.go:146 +0x55
created by github.com/hashicorp/raft.(*raftState).goFunc
        github.com/hashicorp/raft@v1.1.3-0.20200211192230-365023de17e6/state.go:144 +0x66

[fredrikhgrelland]

Rebased from master and ready for review.

[tgross]

I've checked out the rebase PR and tested it out and everything looks great! 👍

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