Template SNMP Interfaces should use 64-bit values instead of 32-bit values if available

The Template SNMP Interfaces includes Item prototypes as part of its discovery rules.

Two of these are:

Incoming traffic on interface

{#SNMPVALUE} - ifInOctets[{#SNMPVALUE}

]
Outgoing traffic on interface

{#SNMPVALUE} - ifOutOctets[{#SNMPVALUE}

]

These are both 32-bit values, which default to being polled no less than 60 seconds apart. This breaks stats on interfaces > 650Mbps, which is very common in today's GigE, 10GE, 40GE+ environments.

These should probably be updated to use ifInOctets[

{#SNMPVALUE}] / ifOutOctets[{#SNMPVALUE}

] if they are available. These are the 64-bit versions.