Update ITL for check_snmp

[robertkrenn]

Is your feature request related to a problem? Please describe.

When monitoring temperature and humdity sensors with snmp, some devices give the result multiplied by 100 to avoid decimals. This is pretty awful when drawing graphs with this perfdata and even worse in the output

Describe the solution you'd like

check_snmp got the -M "Multiplier" parameter with version 2.3.3 to recalculate for example with 0.01. Please Update the ITL snmp command for using this parameter out of the box instead of needing to redefine the snmp command

thx