switched to configobj parser

Patch by: Fabrice Bellet <fabrice@bellet.info>
Resolves: rhbz#885500

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
latency-performance: disabled THP

resolves: rhbz#887355
fixed fd leaks on subprocesses

resolves: rhbz#890435
Added "close on execute" to all external calls. This workaround could cause
trouble on Windows, but it is unlikely the Tuned will ever run there.
new release (2.1.2)
removed the nobarrier from the virtual-guest profile (data loss prevention)

resolves: rhbz#886956

- updated man page
- minor cosmetic fix to virtual-host profile