/usr/bin/annotate-scripts cannot use date format with whitespace

$ annotate-output "+%F %T" whoami
date: extra operand `%T'
Try `date --help' for more information.
 I: Started whoami
date: extra operand `%T'
Try `date --help' for more information.
 O: glennj
date: extra operand `%T'
Try `date --help' for more information.
 I: Finished with exitcode 0

This is due to not using double quotes to protect the date format.

Please consider the following diff:

$ diff /usr/bin/annotate-output bin/annotate-output
28c28
< echo "`date ${FMT}` $1: $line"
---
> printf "%s %s: %s\n" "$(date "$FMT")" "$1" "$line"
78c78
< echo "`date ${FMT}` I: Started $@"
---
> addtime I <<< "Started $*"
83c83
< echo "`date ${FMT}` I: Finished with exitcode $EXIT"
---
> addtime I <<< "Finished with exitcode $EXIT"

Test with: annotate-output "+%F %T" sh -c 'echo stdout; echo stderr >&2'

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: devscripts 2.11.6ubuntu1.6
ProcVersionSignature: Ubuntu 3.2.0-60.91-generic-pae 3.2.55
Uname: Linux 3.2.0-60-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Mon Mar 31 10:55:34 2014
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
MarkForUpload: True
SourcePackage: devscripts
UpgradeStatus: No upgrade log present (probably fresh install)