Use lower case for operating system names

uReport should probably use an existing schema for operating system
names (see [1]). In the meantime, let's make the information from
/etc/system-release lowercase in order for faf to at least recognize
fedora.

Closes #77.

[1] https://github.com/abrt/satyr/issues/77

Signed-off-by: Martin Milata <mmilata@redhat.com>
Signed-off-by: Richard Marko <rmarko@redhat.com>
Don't include user info in kerneloops ureport

Closes #80.

Signed-off-by: Martin Milata <mmilata@redhat.com>
Signed-off-by: Richard Marko <rmarko@redhat.com>