Synchronise the update 10 RPMs templates with the official EMI-3 repositories

However, in the thirdparty sl6 x86_64 repository, the
condor-emi-7.8.7-7.sl6.x86_64.rpm package has to be rename as
condor-emi-7.8.7-7.x86_64.rpm to correspond to its real name.
The deleted RPMs are provided by EPEL.