Change tests to cover both major code paths in ccn_btree_insert_entry.
Change tests to cover both major code paths in ccn_btree_insert_entry.

ebollens/ccnmp,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,svartika/ccnx,ebollens/ccnmp,cawka/ndnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,ebollens/ccnmp,svartika/ccnx,svartika/ccnx