Fix calculation of score for gateway and bridge problems.

Because wrong casting lm['gateway'] and lm['bridge'] always received True value.

Change-Id: Id750ef496ae1983be20b9bd61d5757fc37ba39b3
Bug-Url: https://bugzilla.redhat.com/1164557
Signed-off-by: Artyom Lukianov <alukiano@redhat.com>