Adjust sig finding behavior in indpendent mode
Adjust sig finding behavior in indpendent mode

In indpendent mode, there are cases where we want to look for signatures
elsewhere in the cache, if not found in the local cache, that were not
covered previously.

Signed-off-by: Dave Heller <dadf76b92c028da3488e57973c6c8cd3d5ab990c@linux.vnet.ibm.com>

hellerda/sb-signing-utils,hellerda/sb-signing-utils