Centos 8 Stream removed the capabilities to open raw sockets from the
ping binary and added new sysctl default to allow an unprivileged user
to send ping request. This sysctl was not inherited by the
amphora-haproxy namespace. Add it explicitly to our sysctl list.
Story 2009953
Task 44911
Change-Id: I499bdd5edc23b602495a9b2b9f22baf9547261d5
(cherry picked from commit cbf79c5627e1888611f9212a539b56ceaba1bfeb)
(cherry picked from commit 8cd697e8bf7b91d1d010a3968a440358e8e12dbb)
2e5bc33494