CTOR-1220 : Plugin(database::informix::snmp) - Mode(log-file-usage) : consider log files with state backedUpButNeeded as free space

[sfarouq-ext]

Centreon team (internal PR) : CTOR-1220

Description

COMMUNITY CONTRIBUTION : #4943

The informix snmp plugin log file usage adds up all the used space in log files.
Only free or newly created log files are 0% used. When log file is backed up, it's available to be used again, but it only gets cleared before it is converted to current. So in a running environment, log file used space appear to be 99% used all the time, which is misleading.
If you were going to create an alarm on low log file free space, you wouldn't take into account backed up log files because they can be considered as free space.
This patch takes into account the log file state before adding it as used space. If it is backed up, it considers it as free space, and doesn't add it to used space.

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Functionality enhancement or optimization (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software

How this pull request can be tested ?

See tests

Checklist

• I have rebased my development branch on the base branch (develop).
• I have implemented automated tests related to my commits.
  • Data used for automated tests are anonymized.
• After having created the PR, I will make sure that all the tests provided in this PR have run and passed.