eigrpd: First steps towards EIGRP authentication
*added Quagga's keychain infrastructure to EIGRP daemon
Merge branch 'EIGRP-Development' of https://github.com/janovic/Quagga-EIGRP.git into EIGRP-Development
eigrpd: 
* Added file eigrp_hello.c to Makefile.am for correct compilation.
* Resolved compilation error