Re: [sr-dev] [kamailio/kamailio] snmpstats: add parameter to specify SNMP version (#2846)

### Background I saw an error in the logs ``` ERROR: snmpstats [snmpSIPCommonObjects.c:200]: handle_kamailioSIPServiceStartTime(): failed to read from sysUpTime file at /tmp/kamailio_SNMPAgent.txt ``` and began to figure out what kind of file it is. The file is filled with the command output ``` # snmpget -Ov -c public localhost .1.3.6.1.2.1.1.3.0 ```

### Actual behavior Manual command execution failed ``` # snmpget -Ov -c public localhost .1.3.6.1.2.1.1.3.0 snmpget: No securityName specified ```

### Expected behavior Command returns uptime (in this case I specified SNMP version) ``` # snmpget -v2c -Ov -c public localhost .1.3.6.1.2.1.1.3.0 Timeticks: (60857281) 7 days, 1:02:52.81 ```