Silence the curl check on prepare
Silence the curl check on prepare

`command` prints to stdout if the command is found, so redirect also
it to /dev/null.

chadzilla2080/knife-solo,matschaffer/knife-solo,matschaffer/knife-solo,matschaffer/knife-solo,chadzilla2080/knife-solo,analog-analytics/knife-solo,a2ikm/knife-solo,chadzilla2080/knife-solo,coletivoEITA/knife-solo,a2ikm/knife-solo,leonid-shevtsov/knife-solo,leonid-shevtsov/knife-solo,analog-analytics/knife-solo,coletivoEITA/knife-solo,analog-analytics/knife-solo,coletivoEITA/knife-solo,a2ikm/knife-solo,leonid-shevtsov/knife-solo