Switch repo to use mirrors file

Might be worth deleting the docker file in the box before running apt as it causes

    master: Installing new version of config file /etc/init.d/docker ...
    master: Configuration file '/etc/default/docker'
    master:  ==> Modified (by you or by a script) since installation.
    master:  ==> Package distributor has shipped an updated version.
    master:    What would you like to do about it ?  Your options are:
    master:     Y or I  : install the package maintainer's version
    master:     N or O  : keep your currently-installed version
    master:       D     : show the differences between the versions
    master:       Z     : start a shell to examine the situation
    master:  The default action is to keep your current version.
    master: *** docker (Y/I/N/O/D/Z) [default=N] ?
    master: Configuration file '/etc/default/docker'
    master:  ==> Modified (by you or by a script) since installation.
    master:  ==> Package distributor has shipped an updated version.
    master:    What would you like to do about it ?  Your options are:
    master:     Y or I  : install the package maintainer's version
    master:     N or O  : keep your currently-installed version
    master:       D     : show the differences between the versions
    master:       Z     : start a shell to examine the situation
    master:  The default action is to keep your current version.
    master: *** docker (Y/I/N/O/D/Z) [default=N] ?
    master: dpkg: error processing package docker-engine (--configure):
    master:  EOF on stdin at conffile prompt

rancher / vagrant

Switch repo to use mirrors file #44