Create local_backup_restore.sh

[JoMfN]

Included validator safety flag, so priv_validator_state.json is preserved by default.

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[JoMfN]

Last commit works,

• sudo password passage is handled clean and safe (one time enter direct at beginning to stop-start service)

• priv_validator_state.$(date -u +%Y%m%dT%H%M%SZ).bak.json is stored at .genesis/ by default and restored after data folder is streamed to .genesis/data, can be ommited by opt-out flag --no-keep-validator-state which might be needed if no data folder is available.

• tested ./local_backup_restore.sh -i ./data_12654149.tar.lz4 -s -r on a living data folder and stopping / starting service + file management executed successfully