Some changes on disk failure tests
Some changes on disk failure tests

Change comments to printed information, some cleanup. These changes
are from November 2007. The test is not perfect yet.

Reviewed-by: iustinp


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