proxy: Lift the numbers of opened file descriptors limit
proxy: Lift the numbers of opened file descriptors limit

We were hitting this limit before hitting memory limits in our density
test. Remove it. Linux still has a global limit that will apply, of
course.

Fixes: https://github.com/01org/cc-oci-runtime/issues/1008
Signed-off-by: Damien Lespiau <64bd3cb94f359c1a3ce68dae5e26b40578526277@intel.com>

clearcontainers/proxy,clearcontainers/proxy