Attempt to make a JuNest image build during master push via Travis

[fsquillace]

[fsquillace]

First attempt was to run junest -u in Travis Ubuntu for having a fake ArchLinux and then run junest -b in it. Result: https://travis-ci.org/fsquillace/junest/builds/224900077

The internal mounts --bind did not work with the error:

mount: wrong fs type, bad option, bad superblock on /proc,

       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try

       dmesg | tail or so.

A different strategy is required here. In order to ensure pacman works a mount for the usual directory is required first.