support new parse type 'log' in ssh collect protocol

[tomsun28]

What's changed?

support new parse type 'log' in ssh collect protocol

how to use

  - name: log
    priority: 6
    fields:
      - field: error_log
        type: 1
    protocol: ssh
    ssh:
      host: ^_^host^_^
      port: ^_^port^_^
      username: ^_^username^_^
      password: ^_^password^_^
      privateKey: ^_^privateKey^_^
      timeout: ^_^timeout^_^
      reuseConnection: ^_^reuseConnection^_^
      script: tail -f -n 10 xxx.log
      parseType: log

Checklist

• I hereby agree to the terms of the HertzBeat CLA
• I have read the Contributing Guide
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

Add or update API

• I have added the necessary e2e tests and all cases have passed.