remove unneeded includes, use calloc for traces

The dependency on libgenloc was tenuous and was only needed for
allocating an n * m matrix. Switched to a calloc call, which no longer
requires linking against libperf (which BRTT doesn't distribute with
pre-compiled versions of Antelope contrib)

Also removed arpa/inet.h include since deviants.h has the same htons and
htonl declarations in it