Change log level for setting default value of 'httpRequestHeapMaxBlocks' to DEFAULT instead of INFO

[Gautham-coder]

Proposed changes

Change of log level from INFO to DEBUG

This PR addresses Issue: https://github.com/zowe/zss/issues/718

Type of change

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• [x] Bug fix (non-breaking change which fixes an issue)

PR Checklist

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• [ ] If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• [x] My code follows the style guidelines of this project (see: Contributing guideline)
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] New and existing unit tests pass locally with my changes
• [ ] video or image is included if visual changes are made
• [x] Relevant update to CHANGELOG.md
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works, or describe a test method below