Merge pull request #356 from reneme/fix_test_40_41_slc5

FIX: Integration Tests 040 and 041 on SLC 5
Merge pull request #357 from reneme/fix_test_015_slc5

FIX: Opportunistically Restart Autofs After Hard Crash in Test 015
Merge pull request #350 from reneme/local_repo_scrubbing

Extension of the Local Repository Scrubbing Tool
opt-in of full data integrity check in cvmfs_server check
run data integrity check in test cases
FIX: misleading variable name in swissknife scrub
do storage integrity check first