[MAKEFILE] Properly label build/docker artifacts as .SECONDARY
[MAKEFILE] Properly label build/docker artifacts as .SECONDARY

Some objects such as build/docker/bin/peer end up being classified
as .INTERMEDIATE objects because of the way we use wildcarding.  The
side effect is that these artifacts may be implicitly deleted in
many/most circumstances, the result of which is that they then
need to be recompiled _every_ time rather than taking advantage
of build-caching.  We can fix this by marking them explicitly
as .SECONDARY artifacts

Fixes FAB-243

Change-Id: If45b0f5c7863d26a061831373187895069573fbb
Signed-off-by: Greg Haskins <640d9fe47775e6723f0355b7315e38f7d98d3539@gmail.com>

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