feature: Added NFS-server application support (#6320)

* update

just realized the pull script is a bad idea. not really portable. no
nfsv2 stats for centos 7+

* some php errors

* fixed v4ops

removed nfs-server.sh, as only cat /proc/net/rpc/nfsd is needed as an
extend.

* split rrd

split rrd to store and pull them seperatly

* scrutinizer-ci fix

scrutinizer-ci fix

* phpcbf

* messed up

* stuck, please ignore

* applied reviews murrant suggestions

applied reviews murrant suggestions

* dirty scope

dirty scope was the issue

* style fix ?

* style PSR2

* file handle chart

* fixed style + added documentation

* applied review tasks by murrant, thx murrant!

* applied laf's review, also added tabs in the view to reduce the amount of graphs per page

html/includes/functions.inc.php

@@ -72,6 +72,9 @@ function nicecase($item)
 
         case 'nfs-v3-stats':
             return 'NFS v3 Stats';
+            
+        case 'nfs-server':
+            return 'NFS Server';
 
         case 'ntp':
             return 'NTP';