MoTD with vanity links.

It looks like 'Links + original logo' in https://wiki.onosproject.org/x/GYFI

Change-Id: I89f8b3d52680d1749df9c42df2423c923480d704

@@ -19,7 +19,12 @@ welcome = Welcome to Open Network Operating System (ONOS)!\r\n\
 \u001B[1;31m   / /_/ /    / /_/ /\\ \\     \u001B[0m\r\n\
 \u001B[1;31m   \\____/_/|_/\\____/___/     \u001B[0m\r\n\
 \u001B[1;31m                               \u001B[0m\r\n\
-  \r\n\
+Documentation: wiki.onosproject.org      \r\n\
+Tutorials:     tutorials.onosproject.org \r\n\
+Mailing lists: lists.onosproject.org     \r\n\
+\r\n\
+Come help out! Find out how at: contribute.onosproject.org \r\n\
+\r\n\
   Hit '\u001B[1m<tab>\u001B[0m' for a list of available commands\r\n\
      and '\u001B[1m[cmd] --help\u001B[0m' for help on a specific command.\r\n\
   Hit '\u001B[1m<ctrl-d>\u001B[0m' or type '\u001B[1msystem:shutdown\u001B[0m' or '\u001B[1mlogout\u001B[0m' to shutdown ONOS.\r\n