Improve disk consistency error message again
Improve disk consistency error message again

This new version includes all the possible failure options.

Reviewed-by: iustinp



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