provider/triton: New provider for Joyent Triton

[jen20]

This brings across the following resources for Triton from the joyent/triton-terraform repository, and converts them to the canonical Terraform style, introducing Terraform-style documentation and acceptance tests which run against the live API rather than the local APIs:

• triton_firewall_rule
• triton_machine
• triton_key

This was previously merged as #5277, but was reverted in 85b4b58 because of some incompatible licensing which became apparent post-merge. These have now been resolved by @misterbisson and the team at Joyent, so this can be re-merged!

[phinze]

LGTM - let's do this thing!

[jen20]

Acceptance test run:

$ make testacc TEST=./builtin/providers/triton
==> Checking that code complies with gofmt requirements...
/Users/James/Code/go/bin/stringer
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/triton -v  -timeout 120m
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccTritonFirewallRule_basic
--- PASS: TestAccTritonFirewallRule_basic (8.17s)
=== RUN   TestAccTritonFirewallRule_update
--- PASS: TestAccTritonFirewallRule_update (13.69s)
=== RUN   TestAccTritonFirewallRule_enable
--- PASS: TestAccTritonFirewallRule_enable (13.01s)
=== RUN   TestAccTritonKey_basic
--- PASS: TestAccTritonKey_basic (17.82s)
=== RUN   TestAccTritonMachine_basic
--- PASS: TestAccTritonMachine_basic (167.51s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/triton 220.206s

[ghost]

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