cloning mongodb fails

[eschrock]

Expected Behavior

Create a mongo DB, create commits, push to s3, then try to clone.

Actual Behavior

$ titan clone s3web://demo.titan-data.io/jpmc mongo
Creating repository mongo
Creating docker volume mongo/v0 with path /data/configdb
Creating docker volume mongo/v1 with path /data/db
Command failed: docker run --label io.titandata.titan --mount type=volume,src=mongo/v0,dst=/data/configdb,volume-driver=titan --mount type=volume,src=mongo/v1,dst=/data/db,volume-driver=titan --name mongo --label io.titandata.titan --mount type=volume,src=mongo/v1,dst=/data/db,volume-driver=titan -p 27017:27017 -d mongo@sha256:08105c3b620f4feea45c7f26fa0024d546f7cf1bebc391325937f56104545239 
docker: Error response from daemon: Duplicate mount point: /data/db.
See 'docker run --help'.

Deleting volume mongo/v0
Deleting volume mongo/v1
mongo removed
``

## Steps to Reproduce the Problem

Run `titan clone s3web://demo.titan-data.io/jpmc mongo`