Refs #100318 ccncat should exit if it detects an error in its connection to ccnd. Also, fix usage message to show -h (help) and -p n (pipeline size) options.
Refs #100318 ccncat should exit if it detects an error in its connection to ccnd.
Also, fix usage message to show -h (help) and -p n (pipeline size) options.

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