Redis: don't synth 'README.rst'. (#6262)
Redis: don't synth 'README.rst'. (#6262)

Closes #6260.
GoogleCloudPlatform/gcloud-python,dhermes/gcloud-python,jonparrott/google-cloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,dhermes/google-cloud-python,tswast/google-cloud-python,jonparrott/gcloud-python,dhermes/google-cloud-python,tseaver/google-cloud-python,dhermes/gcloud-python,tswast/google-cloud-python,googleapis/google-cloud-python,googleapis/google-cloud-python,tseaver/google-cloud-python,jonparrott/google-cloud-python,dhermes/google-cloud-python,tswast/google-cloud-python,jonparrott/gcloud-python