o Cache the process's struct prison so as to create a more visually   appealing code structure.  In particular, s/req->p->p_ucred->cr_prison/pr/
o Cache the process's struct prison so as to create a more visually
  appealing code structure.  In particular, s/req->p->p_ucred->cr_prison/pr/

Requested by:	imp, jhb, jake, other hangers on

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase