Make backend._GetVGInfo check the validity of 'vgs'
Currently, the function backend._GetVGInfo only checks for errors via the exit code of the 'vgs' command. However, there are other ways of failure so we need to also check for valid output before parsing. Furthermore, the checks on the exit code were reported via a 'raise LVMError', however this exception is not handled anywhere and so the remote caller will not get reasonable data. This patch does two main things: - change the calling protocol for this function to not raise an error, and instead return the same type of argument always (dict) with the requested keys but values changed into None; this allows in the parent rpc call node_info to have valid memory information but "error" value for disk space, if there's an error with disks - check the validity of the output so that in case we fail to parse it, we don't abort with a backtrace in the node daemon but instead return the default result value (containing errors), and log these cases in the node daemon log file We also bump the protocol version to 11. Reviewed-by: ultrotter