MINOR: config: Deprecate and ignore tune.chksize global option

This option is now ignored because I/O check buffers are now allocated using the
buffer pool. Thus, it is marked as deprecated in the documentation and ignored
during the configuration parsing. The field is also removed from the global
structure.

Because this option is ignored since a recent fix, backported as fare as 2.2,
this patch should be backported too. Especially because it updates the
documentation.
diff --git a/src/tcpcheck.c b/src/tcpcheck.c
index 2fa49ec..f5eb8e9 100644
--- a/src/tcpcheck.c
+++ b/src/tcpcheck.c
@@ -2737,7 +2737,7 @@
 				memprintf(errmsg, "'%s' expects a integer as argument", args[cur_arg]);
 				goto error;
 			}
-			/* Use an signed integer here because of chksize */
+			/* Use an signed integer here because of bufsize */
 			cur_arg++;
 			min_recv = atol(args[cur_arg]);
 			if (min_recv < -1 || min_recv > INT_MAX) {