Allow run-time configuration of core pinning

Use the environment variable "PRRT_CORES" to restrict a PRRT socket to
specific cpu cores.
7 jobs for develop in 1 minute and 50 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #9389
docker
build:container

00:00:22

passed #9388
cmake
build:prrt

00:00:34

 
  Test
passed #9391
bash
test:prrt_functional

00:00:07

passed #9390
valgrind
test:prrt_mem

00:00:37

passed #9392
python3 bash
test:prrt_python_bindings

00:00:14

 
  Deploy
passed #9394
gprof
deploy:profile

00:00:38

passed #9393
python3
deploy:pypi

00:00:16