Fix ci docker to include realpath in 14.04 image
Fix ci docker to include realpath in 14.04 image

See e932850ee19d87ec3ff3ddc31c9a1bc0f8060279
[#109483880](https://www.pivotaltracker.com/story/show/109483880)

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh