Release v1.2.1 on 2019-08-07.

1. cbcc25b Makefile: Build gtp-{link,tunnel} by default, but don't install them by Harald Welte · 6 years ago
2. 18c9c76 tools: gtp-link: rename file now that we support deletion command by Pablo Neira Ayuso · 8 years ago
3. 17c816f gtp-rtnl: Split TID handling for GTPv0 and GTPv1 by Andreas Schultz · 8 years ago
4. 1450666 add libgtpnl by Pablo Neira Ayuso · 10 years ago