* New upstream snapshot. - unittest,tox.ini: catch and fix issue with trusty-level mock of open - block/mdadm: add option to ignore mdadm_assemble errors (LP: #1618429) - curtin/doc: overhaul curtin documentation for readthedocs.org (LP: #1351085) - curtin.util: re-add support for RunInChroot (LP: #1617375) - curtin/net: overhaul of eni rendering to handle mixed ipv4/ipv6 configs - curtin.block: refactor clear_holders logic into block.clear_holders and cli cmd - curtin.apply_net should exit non-zero upon exception. (LP: #1615780) - apt: fix bug in disable_suites if sources.list line is blank. - vmtests: disable Wily in vmtests - Fix the unittests for test_apt_source.