Merge pull request #168 from qiaozhanwei/dev-20190415

tenant code  check update

escheduler-api/src/main/java/cn/escheduler/api/service/TenantService.java

@@ -80,7 +80,7 @@ public class TenantService extends BaseService{
     Tenant tenant = new Tenant();
     Date now = new Date();
 
-    if (!tenantCode.matches("^[0-9a-zA-Z_.]{1,}$") || tenantCode.startsWith("-")){
+    if (!tenantCode.matches("^[0-9a-zA-Z_.-]{1,}$") || tenantCode.startsWith("-") || tenantCode.startsWith(".")){
       putMsg(result, Status.VERIFY_TENANT_CODE_ERROR);
       return result;
     }