koops: don't analyze MCEs like standard oopses

MCEs are not kernel oopses as we know them, MCEs do not have stacktrace
and ABRT drops oopses without meaningful stack trace frames for hashing.
The required files are generated by abrt-action-check-oops-for-hw-errror
because that executable understands the format of MCE data.
  - uuid    (sha1 of backtrace file)
  - duphash (sha1 of backtrace file)
  - kernel  (from dmesg)

Related to #1076820

Signed-off-by: Jakub Filak <jfilak@redhat.com>
ureport: attach contact email if configured

Resolves #1150389

Signed-off-by: Jakub Filak <jfilak@redhat.com>
console-notifications: use return instead of exit

Thanks Ray Strode [halfline] <rstrode@redhat.com>

Related to rhbz#1150169

Signed-off-by: Jakub Filak <jfilak@redhat.com>