Extract downloadEntryCallback function

As part of a EventLog refactor, extract this function into a
log_services utility.

Tested: Only code extraction. Code compiles.

Change-Id: Iaa7aa583a38587c33

Extract downloadEntryCallback function

As part of a EventLog refactor, extract this function into a
log_services utility.

Tested: Only code extraction. Code compiles.

Change-Id: Iaa7aa583a38587c338280af2a9fff65d3732f301
Signed-off-by: Oliver Brewka <oliver.brewka@9elements.com>

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