October maintainer omnibus pre-PR (tests, gdbstub, plugins) Hi, This wraps up my current testing, gdbstub and plugin trees in an attempt to do my part to reduce the qemu-devel fire hose. It is pretty much the same as the September tree except: - dropped RFC patches - dropped CRIS deprecation patches - dropped makefile dependency tweaks - tweaked RUNC as per Paolo's suggestion - used later version of Marcin's sbsa-ref changes - added a FLAKY_TEST removal - added tags as appropriate Now I'm using the pre-PR subject to give people a last chance to object before I roll a proper pull request later this week. The following still could do with review: contrib/plugins: fix coverity warning in hotblocks contrib/plugins: fix coverity warning in lockstep contrib/plugins: fix coverity warning in cache configure: remove gcc version suffixes configure: allow user to override docker engine tests/docker: make docker engine choice entirely configure driven tests/avocado: remove flaky test marking for test_sbsaref_edk2_firmware