MINOR: sample: add missing ARGC_ entries

For a long time we couldn't have arguments in expressions used in
tcp-request, tcp-response etc rules. But now due to the variables
it's possible, and their context in case of failure to resolve an
argument (e.g. backend name not found) is not properly reported
because there is no arg context values in ARGC_* to report them.

Let's add a number of missing ones for tcp-request {connection,
session,content}, tcp-response content, tcp-check, the config
parser (for "set-var" in the global section) and the CLI parser
(for "set-var" on the CLI).
diff --git a/src/sample.c b/src/sample.c
index b9d90ea..a0727d2 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -1160,8 +1160,8 @@
 		case ARGC_TRK:   where = "in tracking rule in"; break;
 		case ARGC_LOG:   where = "in log-format string in"; break;
 		case ARGC_LOGSD: where = "in log-format-sd string in"; break;
-		case ARGC_HRQ:   where = "in http-request header format string in"; break;
-		case ARGC_HRS:   where = "in http-response header format string in"; break;
+		case ARGC_HRQ:   where = "in http-request expression in"; break;
+		case ARGC_HRS:   where = "in http-response response in"; break;
 		case ARGC_UIF:   where = "in unique-id-format string in"; break;
 		case ARGC_RDR:   where = "in redirect format string in"; break;
 		case ARGC_CAP:   where = "in capture rule in"; break;
@@ -1170,6 +1170,13 @@
 		case ARGC_SPOE:  where = "in spoe-message directive in"; break;
 		case ARGC_HERR:  where = "in http-error directive in"; break;
 		case ARGC_OT:    where = "in ot-scope directive in"; break;
+		case ARGC_TCO:   where = "in tcp-request connection expression in"; break;
+		case ARGC_TSE:   where = "in tcp-request session expression in"; break;
+		case ARGC_TRQ:   where = "in tcp-request content expression in"; break;
+		case ARGC_TRS:   where = "in tcp-response content expression in"; break;
+		case ARGC_TCK:   where = "in tcp-check expression in"; break;
+		case ARGC_CFG:   where = "in configuration expression in"; break;
+		case ARGC_CLI:   where = "in CLI expression in"; break;
 		}
 
 		/* set a few default settings */