MINOR: quic: Connection TX buffer setting renaming.

Rename "tune.quic.conn-buf-limit" to "tune.quic.frontend.conn-tx-buffers.limit"
to reflect the stream direction (TX) and the objects (frontends) which are
concerned.
diff --git a/src/cfgparse-quic.c b/src/cfgparse-quic.c
index e89b5a2..8ccb83b 100644
--- a/src/cfgparse-quic.c
+++ b/src/cfgparse-quic.c
@@ -90,7 +90,7 @@
 	}
 
 	suffix = args[0] + prefix_len;
-	if (strcmp(suffix, "conn-buf-limit") == 0)
+	if (strcmp(suffix, "frontend.conn-tx-buffers.limit") == 0)
 		global.tune.quic_streams_buf = arg;
 	else if (strcmp(suffix, "frontend.max-streams-bidi") == 0)
 		global.tune.quic_frontend_max_streams_bidi = arg;
@@ -106,7 +106,7 @@
 
 static struct cfg_kw_list cfg_kws = {ILH, {
 	{ CFG_GLOBAL, "tune.quic.backend.max-idle-timeou", cfg_parse_quic_time },
-	{ CFG_GLOBAL, "tune.quic.conn-buf-limit", cfg_parse_quic_tune_setting },
+	{ CFG_GLOBAL, "tune.quic.frontend.conn-tx-buffers.limit", cfg_parse_quic_tune_setting },
 	{ CFG_GLOBAL, "tune.quic.frontend.max-streams-bidi", cfg_parse_quic_tune_setting },
 	{ CFG_GLOBAL, "tune.quic.frontend.max-idle-timeout", cfg_parse_quic_time },
 	{ CFG_GLOBAL, "tune.quic.retry-threshold", cfg_parse_quic_tune_setting },