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Allow get_config to supply a default so that system can handle misisng config values during upgrade from older sites that are meant to be set duing upgrade, eg 'cacheversion' behatnotneeded - upgrade issue Change-Id: Ieaea390d57c18f3bc3e0808026ec1e76636bcc15 Signed-off-by: Robert Lyon <robertl@catalyst.net.nz> (cherry picked from commit d7c297f1)
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