The detectConfChange presently returns several values, not all of which
are always non-nil, and not all of which being nil caused fatal results.
This is a pre-amble to converting the consenter id -> TLS cert map to a
slice of ids.

Change-Id: I02d01137e5cb0ce1250c166539170c44575e4fd4
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>