build/repositories: list available pools if fail to attach
build/repositories: list available pools if fail to attach

When failing to attach to a pool, it's useful to have the list of the
available pools that we can attach to.

enovance/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,lebauce/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy,lebauce/edeploy