error: Revert unwanted change of warning messages

error: Revert unwanted change of warning messages

Commit 97f4030 changed warning messages from

    timestamp-if-enabled progname ":" location "warning: " message

to

    "warning: " timestamp-if-enabled progname ":" location message

This regressed qemu-iotests 051.  Put "warning: " right back where it
was, along with "info: ".

Reported-by: Kevin Wolf <[email protected]>
Cc: Alistair Francis <[email protected]>
Signed-off-by: Markus Armbruster <[email protected]>
Message-Id: <1500449614[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Reviewed-by: Kevin Wolf <[email protected]>