Fix Fedora builds on Ubuntu

Change Ibffa1b986b52a1dc28de8d3b8056eed92aae9ee7 broke Fedora
builds on Ubuntu. The problem is load_policy has no policy to
load in Ubuntu.

Using the -N option with semanage fcontext removes the need to
load the SELinux policy.

Change-Id: Ie2289e75bb4a7f1240916c613e500f512937283d
Closes-Bug: 1347295
Merge "Fix Fedora builds on Ubuntu"