Update .gitignore to ignore the testing directory.
Update .gitignore to ignore the testing directory.

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