New bugfix release:
- packaging: detect/disable broken seeds in the postinst
- cmd/snap,seed: validate full seeds (UC 16/18)
- snap: add
snap debug state --is-seededhelper - devicestate: generate warning if seeding fails
- store: support for search API v2
- cmd/snap-seccomp/syscalls: update the list of known syscalls
- snap/cmd: the model command needs just a client, no waitMixin
- tests: cleanup security-private-tmp properly
- wrappers: fix timer schedules that are days only
- tests: update proxy-no-core to match latest CDN changes
- cmd/snap-failure,tests: make snap-failure more robust
- tests, many: don't use StartLimitInterval anymore, unify snapd-
failover variants, build snapd snap for UC16 tests