CORTX-34154: motr logs are not in compressed format (Seagate#2129)

Problem:
Support bundle was not collecting the motr logs correctly. 
Earlier the logs were collected in tar format.
The issue was caused due to EOS-24059

Solution:
Modified the m0reportbug script to correctly print the size of disk usage of the specified directory

Signed-off-by: Swapnil Chaudhary <swapnil.chaudhary@seagate.com>

utils/m0reportbug

@@ -157,10 +157,12 @@ main() {
     done
 
     # Helps in debugging, If m0reportbug fails due to huge size
-    echo "du -sh $LIVE_CORE_DIR" >&2
-    du_output=`du -sh "$LIVE_CORE_DIR" 2>&1`
-    echo "$du_output" >&2
-    echo "The size of $LIVE_CORE_DIR is : $du_size"
+    if [ -d "$LIVE_CORE_DIR" ]; then
+	echo "du -sh $LIVE_CORE_DIR" >&2
+	du_output=`du -sh "$LIVE_CORE_DIR" 2>&1`
+	du_size=`echo $du_output | awk '{print $1}'`
+	echo "The size of $LIVE_CORE_DIR is : $du_size"
+    fi
 
     # Create directory and put only latest files created into it.
     TEMP_WORKSPACE="$LIVE_CORE_DIR/tmpspace/"