valgrind test will try to load debug information for the modules present
in a stack trace. If it fails to do it, we endup with a stack trace with
only memory addresses.
We install debuginfo for all installed packages and look for all libs
in the system common locations, and try to install the corresponding
debug information package.
These are acomplished with debuginfo-install yum utility script.
MozReview-Commit-ID: 76mHOUKKJud
Wander Lairson Costa