Temporarily disable vagrant-cachier
Temporarily disable vagrant-cachier

This will slow down provisioning times, but fixes issues with apt that
appear to be caused by vagrant-cachier. Should re-enable when
https://github.com/fgrehm/vagrant-cachier/issues/128 is resolved.

mark-in/securedrop-prov-upstream,mark-in/securedrop-prov-upstream,mark-in/securedrop-prov-upstream,mark-in/securedrop-prov-upstream