Gitian for Fedora

These RPM packages should allow Gitian VM-based builds to work on Fedora 25.

• apt-cacher-ng (shipped in Fedora)
• python-vmbuilder [Link] - updated March 6th for Fedora 25

Updated: March 6th, 2017

Notes:

• Recently Fedora seems to have locked down /tmp mount permissions with options nodev and nosuid.  To use Gitian's make-base-vm as-is you could temporarily change the /tmp mount permissions.  After you install the base image you no longer need these less protective restrictions on /tmp.
• Temporary workaround: mount -o remount,dev,suid /tmp
• Undo workaround: mount -o remount,nodev,nosuid /tmp