0.5-rc - interpolation inconsistencies

[jippi]

Hi,

I've just hit a care where interpolation works for check = script while check = tcp does not interpolate.

      # this service is used to give all sentinel servers
      # a common connection point when bootstrapping the cluster.
      #
      # we only really use NOMAD_ALLOC_INDEX = 0
      service {
        name = "redis-discovery"
        port = "redis"
        tags = ["index-${NOMAD_ALLOC_INDEX}"]

        check {
          type     = "tcp"
          name     = "redis-discovery tcp check #${NOMAD_ALLOC_INDEX}"
          port     = "redis"
          interval = "10s"
          timeout  = "2s"
        }
      }

      # this service will register any redis instance that
      # have more than env(REQUIRED_NUMBER_OF_SLAVES || 0) slaves
      #
      service {
        name = "redis"
        port = "redis"
        tags = ["master"]

        check {
          type     = "script"
          name     = "redis script check #${NOMAD_ALLOC_INDEX}"
          interval = "10s"
          timeout  = "5s"
          command  = "/usr/local/bin/check-redis-master"
        }
      }

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