fstrim-all should show output on success

[Sparhawk]

Currently, from the fstrim-all man page, "there is no output on success." Hence, there is no way of finding out which partitions fstrim-all thinks support trimming, and hence which partitions have been trimmed.

In addition, it is impossible to get statistics about the trim, similar to
    sudo fstrim / -v

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: util-linux 2.20.1-5.1ubuntu18
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Apr 6 11:29:43 2014
InstallationDate: Installed on 2012-12-16 (475 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
SourcePackage: util-linux
UpgradeStatus: Upgraded to trusty on 2014-04-02 (3 days ago)
modified.conffile..etc.cron.weekly.fstrim: [modified]
mtime.conffile..etc.cron.weekly.fstrim: 2014-04-06T11:22:36.334309

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.