news for sanitizer builds

I recently found sanitizer build failures, for example in libosmocore, which our gerrit build job doesn't catch. At first I thought something was amiss and maybe our gerrit sanitizer build were broken. Instead, it turns out my debian9 gcc -fsanitize=address -fsanitize=undefined finds many more issues that the debian8 one does not. https://jenkins.osmocom.org/jenkins/job/gerrit-libosmocore/36/a2=default,a3… I already have a long series for mem leak fixes for libosmocore, mostly in the regression testing code, but I count three real mem leak fixes in libosmocore production code. My plan is to merge the fixes and then actually move the libosmocore-gerrit to debian 9 (or at least add debian 9) to make sure we don't add insanities that the debian 9 build would find. See https://gerrit.osmocom.org/4861 to https://gerrit.osmocom.org/4875. I'm also taking a look at the other CellNet builds. The root motivation was to find out why osmo-hnbgw doesn't work for me anymore currently. ~N