use new check_url_available promise from slapos.toolbox 0.123

See merge request nexedi/slapos!1022
2 jobs for feature/monitor-switch-softwaretype in 0 seconds
Status Job ID Name Coverage
  External
canceled SlapOS.SoftwareReleases.IntegrationTest-py3-luke/feature/monitor-switch-softwaretype

03:28:36

canceled SlapOS.SoftwareReleases.IntegrationTest-py3-luke/feature/monitor-switch-softwaretype

25:14:29