[fix] Misc script convention changes

* Remove sudo from scripts that are already running as sudo
* Also remove sudo from several so scripts and add sudo check
* Remove .sh extension from user facing scripts
* Remove superfluous # characters from so scripts
* Rename scripts to follow so-{subject}-{verb} naming convention
* Add shebangs where missing

setup/install_scripts/00-so-checksum-offload-disable

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [ "$NM_DISPATCHER_ACTION" == "pre-up" ]; then
+    if ["$DEVICE_IFACE" !== "$MAININT"]; then
+        for i in rx tx sg tso ufo gso gro lro; do 
+            ethtool -K $DEVICE_IFACE $i off; 
+        done
+    fi
+fi