feat(contrib/snmp2cpe): update convert command

[MaineK00n]

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What did you implement:

skip invalid CPE and replace space with underscore

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

before

$ snmp2cpe version
snmp2cpe 0.34.0 5bcf29389a4705ad8aea6db6ce75e9d755ee17fc-2025-09-06T08:12:25Z

$ echo '{"****":{"sysDescr0":"Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.06.06E RELEASE SOFTWARE (fc1)\r\nTechnical Support: http://www.cisco.com/techsupport\r\nCopyright (c) 1986-2016 by Cisco Systems, Inc.\r\nCompiled Sat 17-Dec-","entPhysicalTables":{"1":{"entPhysicalName":"c38xx Stack"}}}}' | snmp2cpe convert
{"****":["cpe:2.3:o:cisco:ios_xe:03.06.06e:*:*:*:*:*:*:*","cpe:2.3:h:cisco:c38xx stack:-:*:*:*:*:*:*:*"]}

// "cpe:2.3:h:cisco:c38xx stack:-:*:*:*:*:*:*:*" is invalid.
// CPE does not allow spaces.

after

$ echo '{"****":{"sysDescr0":"Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.06.06E RELEASE SOFTWARE (fc1)\r\nTechnical Support: http://www.cisco.com/techsupport\r\nCopyright (c) 1986-2016 by Cisco Systems, Inc.\r\nCompiled Sat 17-Dec-","entPhysicalTables":{"1":{"entPhysicalName":"c38xx Stack"}}}}' | snmp2cpe convert
{"****":["cpe:2.3:o:cisco:ios_xe:03.06.06e:*:*:*:*:*:*:*","cpe:2.3:h:cisco:c38xx_stack:-:*:*:*:*:*:*:*"]}

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

Reference

[shino]

🍻