flux-start silently ignores --recovery when -s, --test-size is also present

[grondo]

 grondo@corona211:~$ flux start -s1 --recovery=flux-f3HJRCdtW9kj-dump.tgz flux getattr content.restore
flux-getattr: content.restore: No such file or directory
Jun 07 13:46:34.477875 broker.err[0]: rc2.0: flux getattr content.restore Exited (rc=1) 0.0s
flux-start: 0 (pid 945109) exited with rc=1
 grondo@corona211:~$ flux start --recovery=flux-f3HJRCdtW9kj-dump.tgz flux getattr content.restore
flux-f3HJRCdtW9kj-dump.tgz

[garlick]

Doh! The examples in flux-start(1) even say to use --test-size with --recovery.