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

Convert bash script to python3.

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