[Code formatting: Change indentation style to space](https://github.com/clicon/clixon/issues/379)

* Applies to all c/h/y/l/sh files and .editorconfig

test/test_confirmed_commit.sh

@@ -47,12 +47,12 @@ module clixon-example{
 
     /* Generic config data */
     container table{
-	list parameter{
-	    key name;
-	    leaf name{
-		type string;
-	    }
-	}
+        list parameter{
+            key name;
+            leaf name{
+                type string;
+            }
+        }
     }
 }
 EOF
@@ -462,7 +462,7 @@ if [ $BE -ne 0 ]; then
     # Check if premature kill
     pid=$(pgrep -u ${USER} -f clixon_backend)
     if [ -z "$pid" ]; then
-	err "backend already dead"
+        err "backend already dead"
     fi
     # kill backend
     stop_backend -f $cfg