dist/common/scripts: convert scylla_sysconfig_setup to python3
dist/common/scripts: convert scylla_sysconfig_setup to python3

Convert bash script to python3.

scylladb/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,duarten/scylla,avikivity/scylla