Add realpath to the list of installed package on Ubuntu 14.04
Add realpath to the list of installed package on Ubuntu 14.04

This was needed by one of our tests and is not installed by
default on Ubuntu 14.04.

Change-Id: I0050f6f004f23b2b7c1f2b9cebc43fe398e7445c

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration