zebra: Notice when our route is deleted and re-install.

zebra: Notice when our route is deleted and re-install.

The code to reinstall self originated routes was not behaving
correctly.  For some reason we were looking for self originated
routes from the kernel to be of type KERNEL.  This was probably
missed when we started installing the route types.  We should
depend on the self originated flag that we determine from
the callback from the kernel.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com.