software/restic: handle certificate renewal

restart restic after renewing certificate, using the same approach as
software/dufs
2 jobs for fix/renew-cert in 0 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

07:25:16

running SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

15479:41:07