MINOR: connection: add proxy-v2-options authority

This patch add option PP2_TYPE_AUTHORITY to proxy protocol v2 when a TLS
connection was negotiated. In this case, authority corresponds to the sni.
diff --git a/src/server.c b/src/server.c
index 77fc0c6..f4cf45c 100644
--- a/src/server.c
+++ b/src/server.c
@@ -526,6 +526,8 @@
 		} else if (!strcmp(p, "ssl-cipher")) {
 			newsrv->pp_opts |= SRV_PP_V2_SSL;
 			newsrv->pp_opts |= SRV_PP_V2_SSL_CIPHER;
+		} else if (!strcmp(p, "authority")) {
+			newsrv->pp_opts |= SRV_PP_V2_AUTHORITY;
 		} else
 			goto fail;
 	}