volume_mount destination doesn't interpolate

[tgross]

While working on e2e tests for CSI, I discovered the volume_mount.destination field doesn't appear to be interpolated with the alloc dir:

      volume_mount {
        volume      = "test"
        destination = "${NOMAD_ALLOC_DIR}/test"
        read_only   = false
      }

Resulting task event:

2020-03-16T15:31:28-04:00  Driver Failure   failed to create container: API error (400): invalid mount config for type "bind": invalid mount path: '${NOMAD_ALLOC_DIR}/test' mount path must be absolute

[github-actions]

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