Moving pkgtools version to v22 for SLHC on slc6.
Merge pull request #611 from degano/pkgtools22_slhc_slc6

Moving pkgtools version to v22 for SLHC on slc6.
Merge remote branch 'origin/IB/CMSSW_7_0_X/stable' into IB/CMSSW_7_0_X/stable