Fix patch(1) shell injection vulnerability via ed(1). [SA-15:18]

Fix routed remote denial of service vulnerability. [SA-15:19]

MFC r271919:

Fix a bug which could make routed(8) daemon exit by sending a special RIP
query from a remote machine, and disable accepting it by default. This
requests a routed(8) daemon to dump routing information base for debugging
purpose. An -i flag to enable it has been added.

Fix patch(1) shell injection vulnerability via ed(1). [SA-15:18]

Fix routed remote denial of service vulnerability. [SA-15:19]

MFC r271919:

Fix a bug which could make routed(8) daemon exit by sending a special RIP
query from a remote machine, and disable accepting it by default. This
requests a routed(8) daemon to dump routing information base for debugging
purpose. An -i flag to enable it has been added.