MAINT: Log the build cache url if used during the build
MAINT: Log the build cache url if used during the build

This makes it easier to determine which cached version was
used during a build. This will currently display the
"install" url.

Change-Id: Ic9542b6b97df4190fd0059db21a236df498a94b1
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

Signed-off-by: Scott Parlane <85029adc3fa41ef14594a57826619713bfe95f25@alliedtelesis.co.nz>

ATL-NZ/buildsyspp,alliedtelesis/buildsyspp