Ticket #47750 - Creating a glue fails if one above level is a conflict or missing

Bug description: https://fedorahosted.org/389/ticket/47750#comment:16

Fix description: The logic in slapi_is_special_rdn to check if the
RDN is a tombstone or not had a problem.  Even if the first part of
RDN is not nsuniqueid=<UNIQUE_ID>, it was returning true.  In this
patch, code to check the case is added and it returns false if the
first part of RDN is not  nsuniqueid=<UNIQUE_ID>.

Reviewed by [email protected] and [email protected] (Thank you,
Mark and Rich!!)

ldap/servers/slapd/util.c

@@ -1475,7 +1475,7 @@ slapi_is_special_rdn(const char *rdn, int flag)
 	}
 	rp = (char *)rdn;
 	while (rp) {
-		char *comma = NULL;
+		char *endp = NULL;
 		if (!PL_strncasecmp(rp, SLAPI_ATTR_UNIQUEID, SLAPI_ATTR_UNIQUEID_LENGTH) &&
 		    (*(rp + SLAPI_ATTR_UNIQUEID_LENGTH) == '=')) {
 			if (RDN_IS_TOMBSTONE == flag) {
@@ -1492,10 +1492,17 @@ slapi_is_special_rdn(const char *rdn, int flag)
 					return 1;
 				}
 			}
+		} else if (RDN_IS_TOMBSTONE == flag) {
+			/* If the first part of rdn does not start with SLAPI_ATTR_UNIQUEID,
+			 * it's not a tombstone RDN. */
+			return 0;
+		}
+		endp = PL_strchr(rp, ',');
+		if (!endp) {
+			endp = rp + strlen(rp);
 		}
-		comma = PL_strchr(rp, ',');
 		rp = PL_strchr(rp, '+');
-		if (rp && (rp < comma)) {
+		if (rp && (rp < endp)) {
 			plus = 1;
 			rp++;
 		}