integrations-core: SNMP errors with embedded null character

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Output of the info page

root@b157353ac90d:/# s6-svstat /var/run/s6/services/agent/
up (pid 389) 130 seconds

Additional environment details (Operating System, Cloud provider, etc): Synology (DSM 7.0.1-42218) serving SNMP v2 with UPS (TRIPPLITE SMART1500LCD) hooked up to the synology over USB Datadog 7.32.3 running via docker (nomad on the synology)

Config for SNMP:

          instances:
            - ip_address: 192.168.3.2
              snmp_version: 2
              port: 161
              community_string: home
              min_collection_interval: 60
              enforce_mib_constraints: false
              metric_tags:
                - OID: .1.3.6.1.2.1.1.5.0
                  tag: snmp_host
                  symbol: sysName
                - OID: .1.3.6.1.2.1.1.5.0
                  tag: host
                  symbol: sysName
              metrics: # https://global.download.synology.com/download/Document/Software/DeveloperGuide/Firmware/DSM/All/enu/Synology_DiskStation_MIB_Guide.pdf
                - OID: .1.3.6.1.4.1.6574.4.3.6.1
                  name: upsBatteryRuntimeValue
                - OID: .1.3.6.1.4.1.6574.4.3.1.1.0
                  name: upsBatteryChargeValue
                - OID: .1.3.6.1.4.1.6574.4.2.12.1
                  name: upsInfoLoadValue
                - OID: .1.3.6.1.4.1.6574.4.2.1
                  name: upsInfoStatus

output of snmpwalk for those values

$ snmpwalk -v 2c -c home 192.168.3.2 .1.3.6.1.4.1.6574.4.3.6.1
iso.3.6.1.4.1.6574.4.3.6.1.0 = INTEGER: 2232
$ snmpwalk -v 2c -c home 192.168.3.2 .1.3.6.1.4.1.6574.4.3.1.1.0
iso.3.6.1.4.1.6574.4.3.1.1.0 = Opaque: Float: 100.000000
$ snmpwalk -v 2c -c home 192.168.3.2 .1.3.6.1.4.1.6574.4.2.12.1
iso.3.6.1.4.1.6574.4.2.12.1.0 = Opaque: Float: 17.000000
$ snmpwalk -v 2c -c home 192.168.3.2 .1.3.6.1.4.1.6574.4.2.1
iso.3.6.1.4.1.6574.4.2.1.0 = STRING: "OL"

Steps to reproduce the issue:

1. Add that config above

Describe the results you received:

2021-12-17 15:01:32 UTC | CORE | INFO | (pkg/collector/worker/check_logger.go:37 in CheckStarted) | check:snmp | Running check...
2021-12-17 15:01:32 UTC | CORE | WARN | (pkg/collector/python/datadog_agent.go:124 in LogMessage) | snmp:8a868ff1a5a67f44 | (snmp.py:461) | Failed to collect metrics for 192.168.3.2:161 - embedded null character
2021-12-17 15:01:32 UTC | CORE | INFO | (pkg/collector/worker/check_logger.go:56 in CheckFinished) | check:snmp | Done running check

Describe the results you expected:

Id expect upsBatteryRuntimeValue, upsBatteryChargeValue, upsInfoLoadValue, upsInfoStatus to be ingested