Add coverage to individual stages, ignore pylint reducing coverage average
Pass coverage file from unittests to subsequent stages to calculate proper total

Backport installation from master and simplify install

Move things to subfolder so we can add to artifact

Use recent git version from cvmfs

Allow failure for se and cvmfs tests for people that cannot use the proxy

Expire artifacts in 1 day
pass coverage to subsequent tests

Fix missing dirac-proxy-init -x for setest cc7