Cleanup of DRBD8._CheckMetaSize
Cleanup of DRBD8._CheckMetaSize

This patch converts the _CheckMetaSize method to raise exceptions
instead of logging and returning False. This fits now in the new rpc
return types, so it's a cheap change.

Reviewed-by: ultrotter

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