Disable unit test leak checks for DEB packages

The unit tests themselves don't leak memory but some of the core
components of MaxScale do. To ignore this, ASAN_OPTIONS needs to be
defined.

BUILD/build_deb_local.sh

@@ -16,6 +16,8 @@ make
 
 if [[ "$cmake_flags" =~ "BUILD_TESTS" ]]
 then
+    # We don't care about memory leaks in the tests (e.g. servers are never freed)
+    export ASAN_OPTIONS=detect_leaks=0
     # All tests must pass otherwise the build is considered a failure
     ctest --output-on-failure || exit 1
 fi