Add rpm level caching

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Fixes for the RPM caching branch

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Add mock config files (currently unused by default)

Also fix a problem that occurs if the SOURCES directory
does not exist

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Merge pull request #12 from jonludlam/rpmcache2

Rpmcache2