Use symlink instead of mv in creating Alluxio Docker image

Description

Currently, our Docker image normalizes the alluxio install directory by running "mv alluxio-* alluxio". This should be fine, but can run into issues on Centos 7 if the overlay filesystem is set up incorrectly (https://github.com/moby/moby/issues/27358). It's cleaner and safer to use a symlink instead.

This issue came up in a mailing list question: https://groups.google.com/forum/#!topic/alluxio-users/ACk2y_keJxU

Environment

None

Assignee

Andrew Audibert

Reporter

Andrew Audibert

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Affects versions

Priority

Minor
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