MINOR: resolvers: renames resolvers DNS_UPD_* returncodes to RSLV_UPD_*

This patch renames some #defines prefixes from DNS to RSLV.
diff --git a/include/haproxy/dns-t.h b/include/haproxy/dns-t.h
index 48a3952..a542d45 100644
--- a/include/haproxy/dns-t.h
+++ b/include/haproxy/dns-t.h
@@ -335,16 +335,16 @@
  * preference
  */
 enum {
-	DNS_UPD_NO = 1,           /* provided IP was found and preference is matched
+	RSLV_UPD_NO = 1,           /* provided IP was found and preference is matched
                                    * OR provided IP found and preference is not matched, but no IP
                                    * matching preference was found */
-	DNS_UPD_SRVIP_NOT_FOUND,  /* provided IP not found
+	RSLV_UPD_SRVIP_NOT_FOUND,  /* provided IP not found
                                    * OR provided IP found and preference is not match and an IP
                                    * matching preference was found */
-	DNS_UPD_CNAME,            /* CNAME without any IP provided in the response */
-	DNS_UPD_NAME_ERROR,       /* name in the response did not match the query */
-	DNS_UPD_NO_IP_FOUND,      /* no IP could be found in the response */
-	DNS_UPD_OBSOLETE_IP,      /* The server IP was obsolete, and no other IP was found */
+	RSLV_UPD_CNAME,            /* CNAME without any IP provided in the response */
+	RSLV_UPD_NAME_ERROR,       /* name in the response did not match the query */
+	RSLV_UPD_NO_IP_FOUND,      /* no IP could be found in the response */
+	RSLV_UPD_OBSOLETE_IP,      /* The server IP was obsolete, and no other IP was found */
 };
 
 struct proxy;
diff --git a/src/dns.c b/src/dns.c
index 5db3653..a48f685 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -1323,7 +1323,7 @@
  * The following tasks are the responsibility of the caller:
  *   - <dns_p> contains an error free DNS response
  * For both cases above, dns_validate_dns_response is required
- * returns one of the DNS_UPD_* code
+ * returns one of the RSLV_UPD_* code
  */
 int dns_get_ip_from_response(struct resolv_response *r_res,
                              struct resolv_options *resolv_opts, void *currentip,
@@ -1435,14 +1435,14 @@
 				newip6 = ip;
 			currentip_found = currentip_sel;
 			if (score == 15)
-				return DNS_UPD_NO;
+				return RSLV_UPD_NO;
 			max_score = score;
 		}
 	} /* list for each record entries */
 
 	/* No IP found in the response */
 	if (!newip4 && !newip6)
-		return DNS_UPD_NO_IP_FOUND;
+		return RSLV_UPD_NO_IP_FOUND;
 
 	/* Case when the caller looks first for an IPv4 address */
 	if (family_priority == AF_INET) {
@@ -1485,7 +1485,7 @@
 	}
 
 	/* No reason why we should change the server's IP address */
-	return DNS_UPD_NO;
+	return RSLV_UPD_NO;
 
  not_found:
 	list_for_each_entry(record, &r_res->answer_list, list) {
@@ -1495,7 +1495,7 @@
 		LIST_ADDQ(&r_res->answer_list, &record->list);
 		break;
 	}
-	return DNS_UPD_SRVIP_NOT_FOUND;
+	return RSLV_UPD_SRVIP_NOT_FOUND;
 }
 
 /* Turns a domain name label into a string.
diff --git a/src/server.c b/src/server.c
index 03b107b..d33f3de 100644
--- a/src/server.c
+++ b/src/server.c
@@ -4019,20 +4019,20 @@
 	                               &firstip_sin_family, s);
 
 	switch (ret) {
-		case DNS_UPD_NO:
+		case RSLV_UPD_NO:
 			goto update_status;
 
-		case DNS_UPD_SRVIP_NOT_FOUND:
+		case RSLV_UPD_SRVIP_NOT_FOUND:
 			goto save_ip;
 
-		case DNS_UPD_CNAME:
+		case RSLV_UPD_CNAME:
 			goto invalid;
 
-		case DNS_UPD_NO_IP_FOUND:
+		case RSLV_UPD_NO_IP_FOUND:
 			has_no_ip = 1;
 			goto update_status;
 
-		case DNS_UPD_NAME_ERROR:
+		case RSLV_UPD_NAME_ERROR:
 			/* update resolution status to OTHER error type */
 			resolution->status = RSLV_STATUS_OTHER;
 			goto update_status;