eigrpd: Diverse Fixes

eigrpd: Diverse Fixes

* Correct the metric calculation as well as the default metrics;
* Do not show invalid routes in the "show ip eigrp topology".
* Add support to VRFs;
* When downloading a neighbor remove the related routes;
* Fix bugs in the parser of packages they were creating
Invalid default routes;
* Add and remove routes in the zebra;
* Add command "on router eigrp AS";
* Make "delay" and "bandwitch" commands work as well as
Display them in running config;
* Add "no" version of several commands;
* Fix a serious momory leaks;
* Fix segfault when there is no 'successor' route to a
Given prefix;
* Other minor corrections;

Signed-off-by: Renato Westphal <renatowestphal@gmail.com>
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>