Vendir is failing to sync a dir if the previous sync has `disableUnpack: true`

[kumaritanushree]

What steps did you take: Tried to sync dir with the configuration :

apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: vendor
  contents:
  - path: k8s-simple-app-plain
    http:
      url: https://dk-shared-assets.s3.amazonaws.com/k8s-simple-app-example-master.zip

  - path: k8s-simple-app-digested
    http:
      url: https://dk-shared-assets.s3.amazonaws.com/k8s-simple-app-example-master.zip
      sha256: "82685cca45be6b93deb929debe1513cc73110af2f1d4a00b9d0f18f20a104a98"
      disableUnpack: true

  - path: k8s-simple-app-archived
    http:
      url: https://dk-shared-assets.s3.amazonaws.com/k8s-simple-app-example-master.zip
      disableUnpack: true

What happened: Vendir is throwing error:

$ vendir sync    
Fetching: vendor + k8s-simple-app-plain (http from https://dk-shared-assets.s3.amazonaws.com/k8s-simple-app-example-master.zip)

Fetching: vendor + k8s-simple-app-digested (http from https://dk-shared-assets.s3.amazonaws.com/k8s-simple-app-example-master.zip)

Fetching: vendor + k8s-simple-app-archived (http from https://dk-shared-assets.s3.amazonaws.com/k8s-simple-app-example-master.zip)

vendir: Error: Syncing directory 'vendor':
  Syncing directory 'k8s-simple-app-archived' with HTTP contents: open .vendir-tmp/incoming/vendir-http2657742031: no such file or directory

What did you expect: Vendir is renaming path .vendir-tmp/incoming ( created internally by vendir to perform operations) and due to which vendir is not able to find the dir .vendir-tmp/incoming/ in the next sync and throwing this error.

Need to have a special handling of this temporary dir in case of disableUnpack: true.

Anything else you would like to add:

Environment:

• vendir version (execute vendir --version): vendir version 0.30.0
• OS (e.g. from /etc/os-release):

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