Add support for CentOS 7.0 in base role
Merge pull request #107 from TristanCacqueray/master

Add support for CentOS 7.0 in base role
base: Repopulate rpmdb if empty

In some weird cases, the rpmdb is empty breaking the build.
In such case, let's try to repopulate it.

This bug seems to be related with the rpm running on the host while not
having a simple proof of why.