Make fails_with available in spec blocks

Closes #31706.
Move conditional fails_with annotations to spec blocks
scsh: remove env: std

This was fixed by semi-recent fixes to superenv.
aqbanking: move dep to stable block
mpd: provide launchd plist
mpd: update 0.18.12 bottle.

Closes #31709.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
mpdscribble: provide launchd plist
mpdscribble: add 0.22 bottle.

Closes #31710.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
cgrep 6.4.6
cgrep: update 6.4.6 bottle.

Closes #31712.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
etcd 0.4.6
etcd: update 0.4.6 bottle.

Closes #31714.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
etcdctl 0.4.6
etcdctl: update 0.4.6 bottle.

Closes #31715.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
fleetctl 0.7.0
fleetctl: update 0.7.0 bottle.

Closes #31716.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
hydra-cli 1.0.1
hydra-cli: update 1.0.1 bottle.

Closes #31717.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
iperf3 3.0.6
iperf3: update 3.0.6 bottle.

Closes #31718.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>