修复最小rancher版本

templates/elk/0/rancher-compose.yml

@@ -4,7 +4,7 @@ catalog:
     version: "7.0.1"
     description: "微三云定制化ELK日志中心"
     uuid: wsyelk
-    minimum_rancher_version: v1.6.26
+    minimum_rancher_version: v1.6.20
     questions: 
         - variable: host_url
           description: "日志中心访问域名，80端口kibana使用，9200可访问elasticsearch"

templates/log-pilot/0/rancher-compose.yml

@@ -4,7 +4,7 @@ catalog:
     version: "0.9.5"
     description: "日志采集利器"
     uuid: wsylog
-    minimum_rancher_version: v1.6.26
+    minimum_rancher_version: v1.6.20
     questions: 
         - variable: pilot_type
           description: "pilot type，default filebeat"