Fix a wrong exception name
Fix a wrong exception name

This was introduced in rev 208.

Reviewed-by: imsnah


mbakke/ganeti,ganeti/ganeti,dimara/ganeti,onponomarev/ganeti,dimara/ganeti,onponomarev/ganeti,ganeti/ganeti,yiannist/ganeti,grnet/snf-ganeti,andir/ganeti,leshchevds/ganeti,ganeti-github-testing/ganeti-test-1,ganeti-github-testing/ganeti-test-1,grnet/snf-ganeti,yiannist/ganeti,andir/ganeti,bitemyapp/ganeti,apyrgio/ganeti,apyrgio/snf-ganeti,bitemyapp/ganeti,andir/ganeti,apyrgio/snf-ganeti,leshchevds/ganeti,ganeti/ganeti,yiannist/ganeti,leshchevds/ganeti,mbakke/ganeti,mbakke/ganeti,apyrgio/ganeti