Added Seafile Server Monitoring (#10465)

* Seafile Monitoring

* generalized function for application with multiple similar entries

* adding snmprec file

* Create linux_seafile-v1.json

* Update linux_seafile-v1.snmprec

Updated linux_seafile-v1.snmprec to use 4x for encoding json data response

* Update Applications.md

includes/html/graphs/application/seafile_enabled.inc.php

@@ -0,0 +1,11 @@
+<?php
+$unit_text     = 'activated Accounts';
+$unitlen       = 20;
+$bigdescrlen   = 20;
+$smalldescrlen = 20;
+$unit_type     = 'int';
+$category      = 'acc';
+
+$rrdVar='enabled';
+
+require 'seafile-common.inc.php';