a-a-save-kernel-data: support more kernel flavours

Remove assumptions about how a kernel package should be named, look it
up based on /boot/vmlinuz-$kernel_version.

Closes rhbz#1016642.

Signed-off-by: Martin Milata <mmilata@redhat.com>
Merge pull request #725 from abrt/rhbz1016642

a-a-save-kernel-data: support more kernel flavours

Remove assumptions about how a kernel package should be named, look it
up based on /boot/vmlinuz-$kernel_version.

Closes rhbz#1016642.

Signed-off-by: Martin Milata <mmilata@redhat.com>