Galera asserts disables coredumps is wsrep_provider library

Apparently galera core dumps aren't worth debugging.

https://github.com/codership/galera/commit/4f4481d4174cd031e5f8671601acbc3f3943c0c6
Also in MariaDB's fork: https://github.com/MariaDB/galera/blob/3.x/galerautils/src/gu_abort.c

And Codership can't take suggestions:
https://github.com/codership/galera/pull/454

Recommend this be controlled by the the mysqld process or systemd directives under sysadmin control.