Fix up test for curl existence to be more bash-ish.
Fix up test for curl existence to be more bash-ish.

aplanas/crowbar,toabctl/crowbar,mmnelemane/crowbar,vwallfahrer/crowbar,toabctl/crowbar,aspiers/crowbar,nkrinner/crowbar,rsalevsky/crowbar,aspiers/crowbar,SUSE-Cloud/crowbar,tserong/crowbar,crowbar/crowbar,crowbar/crowbar,tserong/crowbar,SUSE-Cloud/crowbar,dirkmueller/crowbar,aplanas/crowbar,rhafer/crowbar,dirkmueller/crowbar,rhafer/crowbar,rsalevsky/crowbar,MaximilianMeister/crowbar,mmnelemane/crowbar,MaximilianMeister/crowbar,rhafer/crowbar,vwallfahrer/crowbar,nkrinner/crowbar