Fix host debug report for Fedora 20

The tool sosreport does not save the report file in /tmp in F20, this
causes a error in Kimchi, which has /tmp hardcoded. This fixes this
problem searching report files in /var/tmp too.
Notice that is possible to pass --tmp-dir as the directory to save the
report file, but this option is crashing in Fedora 20, so the code is
not using it.
This patch also improves the logging and uses new i18n translation
system for exception error messages.

Signed-off-by: Rodrigo Trujillo <rodrigo.trujillo@linux.vnet.ibm.com>