valgrind: bump to 3.10.0

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge pull request #1006 from davidlt/valgrind-3.10.0

valgrind: bump to 3.10.0
gdb: bump to 7.8

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge pull request #1007 from davidlt/gdb-7.8

gdb: bump to 7.8
Merge remote branch 'origin/IB/CMSSW_7_2_X/stable' into IB/CMSSW_7_0_X/stable