HTTP/2: shortened some debug log messages.

This ensures slightly more readable debug logs on 80-character-wide
terminals.

src/http/v2/ngx_http_v2.c

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index 2d60f49..a311de9 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -748,7 +748,7 @@
     type = ngx_http_v2_parse_type(head);
 
     ngx_log_debug4(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
-                   "process http2 frame type:%ui f:%Xd l:%uz sid:%ui",
+                   "http2 frame type:%ui f:%Xd l:%uz sid:%ui",
                    type, h2c->state.flags, h2c->state.length, h2c->state.sid);
 
     if (type >= NGX_HTTP_V2_FRAME_STATES) {
@@ -1316,7 +1316,7 @@
     }
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
-                   "http2 hpack %s string length: %i",
+                   "http2 %s string, len:%i",
                    huff ? "encoded" : "raw", len);
 
     h2scf = ngx_http_get_module_srv_conf(h2c->http_connection->conf_ctx,
@@ -1571,7 +1571,7 @@
 
         if (rc == NGX_OK) {
             ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                           "http2 pseudo-header: \":%V: %V\"",
+                           "http2 header: \":%V: %V\"",
                            &header->name, &header->value);
 
             return ngx_http_v2_state_header_complete(h2c, pos, end);
@@ -1647,7 +1647,7 @@
     }
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                   "http2 http header: \"%V: %V\"",
+                   "http2 header: \"%V: %V\"",
                    &header->name, &header->value);
 
     return ngx_http_v2_state_header_complete(h2c, pos, end);
@@ -3375,7 +3375,7 @@
     ngx_memcpy(p, ending, sizeof(ending));
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                   "http2 http request line: \"%V\"", &r->request_line);
+                   "http2 request line: \"%V\"", &r->request_line);
 
     return NGX_OK;
 }

src/http/v2/ngx_http_v2_filter_module.c

diff --git a/src/http/v2/ngx_http_v2_filter_module.c b/src/http/v2/ngx_http_v2_filter_module.c
index 74aac6e..9070785 100644
--- a/src/http/v2/ngx_http_v2_filter_module.c
+++ b/src/http/v2/ngx_http_v2_filter_module.c
@@ -1269,7 +1269,7 @@
     ngx_http_v2_stream_t *stream)
 {
     ngx_log_debug3(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
-                   "http2:%ui available windows: conn:%uz stream:%z",
+                   "http2:%ui windows: conn:%uz stream:%z",
                    stream->node->id, h2c->send_window, stream->send_window);
 
     if (stream->send_window <= 0) {

src/http/v2/ngx_http_v2_table.c

diff --git a/src/http/v2/ngx_http_v2_table.c b/src/http/v2/ngx_http_v2_table.c
index d4c748f..62025c4 100644
--- a/src/http/v2/ngx_http_v2_table.c
+++ b/src/http/v2/ngx_http_v2_table.c
@@ -180,7 +180,7 @@
     ngx_http_v2_header_t  *entry, **entries;
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
-                   "http2 add header to hpack table: \"%V: %V\"",
+                   "http2 table add: \"%V: %V\"",
                    &header->name, &header->value);
 
     if (h2c->hpack.entries == NULL) {
@@ -293,7 +293,7 @@
     size += 32;
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
-                   "http2 hpack table account: %uz free:%uz",
+                   "http2 table account: %uz free:%uz",
                    size, h2c->hpack.free);
 
     if (size <= h2c->hpack.free) {