* riscli dump-loc-rip: Dump IPv4/IPv6 routes

By default riscli dump-loc-rib will now dump IPv4 and IPv6 routes. The
flags -4 and -6 have been added to restrict dumping to a single address
family.

* riscli dump-loc-rip: Handle EOF from API

* Remove unused function

This unused function triggered go vet

github.com/bio-routing/bio-rd/syscallwrappers
[error]syscallwrappers/syscalls_linux.go:75:9: possible misuse of unsafe.Pointer

* Remove unreachable code

* Use keyed syntax for composite literals

* Remove copies of mutex locks

Refactor net API to use pointers when working with protos

Make BGP path dedup optional. Set init cache size = 0.

* Implement a GetRouters RPC to RIS

This RPC returns all configured routers and their VRF IDs. This can be
used by RIS clients to discovery the routers. The router and the VRF ID
is a required parameter for all other RPCs.

* Update grpc to v1.28.0 to support protoc-gen-go v1.21.0

* Fix test

Co-authored-by: Oliver Herms <oliver.peter.herms@gmail.com>

BGP: Add support for MD5 secret (RFC2385)

Add support for setting TTL on BGP sessions

Add IP Next() method and Prefix BaseAddr()

Fix route withdraw when using BGP add path TX

Fix 32bit ASN handling in BMP