877326 - dskEntry should be cached

commit ca7b17a41d4d16bd27aacf92116bea3562eeea36
Author: Jan Safranek <jsafranek@users.sourceforge.net>
Date:   Mon Dec 17 12:40:32 2012 +0100

    CHANGES: snmpd: use cache for dskTable to speed it up.
    
    UCD-SNMP::dskTable was slow on NFS mounts. Now it uses fsys cache
    to reload mounts every 5 seconds.

diff --git a/agent/mibgroup/ucd-snmp/disk_hw.c b/agent/mibgroup/ucd-snmp/disk_hw.c
index 93ecde3..ea37610 100644
--- a/agent/mibgroup/ucd-snmp/disk_hw.c
+++ b/agent/mibgroup/ucd-snmp/disk_hw.c
@@ -305,8 +305,11 @@ var_extensible_disk(struct variable *vp,
     unsigned long long val;
     static long     long_ret;
     static char     errmsg[300];
+    netsnmp_cache  *cache;
 
-    netsnmp_fsys_load( NULL, NULL );  /* Update the fsys H/W module */
+    /* Update the fsys H/W module */
+    cache = netsnmp_fsys_get_cache();
+    netsnmp_cache_check_and_reload(cache);
 
 tryAgain:
     if (header_simple_table