libatasmart4 reanables SMART when reading SMART information from HDD.

[TheNinja]

1) Ubuntu Version:
Description: Ubuntu 14.04.1 LTS
Release: 14.04

2) Package Version
libatasmart4:
  Installiert: 0.19-3
  Installationskandidat: 0.19-3
  Versionstabelle:
 *** 0.19-3 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status

3) What I expected to happen:
libatasmart4 won't read from devices with have SMART disabled (because sometimes SMART needs to be disabled as workaround, see for example https://bugs.launchpad.net/ubuntu/+source/udisks2/+bug/1373318)

4) What happened instead:
libatasmart4 reenables SMART on devices that have SMART disabled. (libatasmart4 shouldn't second guess the user on this...)

Can be verified with
sudo smartctl --smart=off /dev/sdb
sudo smartctl --all /dev/sdb | grep "SMART support"
sudo skdump --overall /dev/sdb
sudo smartctl --all /dev/sdb | grep "SMART support"