SNMP plugging for Nagios.

General characteristics:

• Support SNMPv2 and SNMPv3.
• TODO Add more device.

check_snmp_load.pl characteristics:

• Request Load Linux.
• Request Load Huawei Router L3 (9303). (for every one module)
• Request Load Huawei Switch L2.

check_snmp_mem.pl characteristics:

• Request Mem Linux.
• Request Mem Huawei Router L3 (9303). (for every one module)

check_snmp_temp.pl characteristics:

• Request Temp Huawei Router L3 (9303). (one sensor and label)
• Request Temp Huawei Switch L2. (one sensor and label)

check_snmp_disk.pl characteristics:

• Request Disk Linux (all mount, only list, except list).