Copy over pre/post test hooks to check-tempest-dsvm-f20-docker

The trusty based check-tempest-dsvm-docker job is working fine
now. Let's copy the hooks to the fedora based job as well.

Change-Id: I2a561565aa0e963e9fc6797d44baba22d190b4e2
Merge "Copy over pre/post test hooks to check-tempest-dsvm-f20-docker"