agent: Fix network usage xml

Signed-off-by: edileuton <edileuton@gmail.com>

agent/network-scripts/net-collected-data/bandwidth-usage.tree

@@ -43,7 +43,7 @@ function xml_print()
     printf "<id>$((COUNT+1))</id>"
     printf "<rx>"
     printf "<rx-packets>$(awk '{ print $2 }' <<< $line)</rx-packets>"
-    printf "<rx-bytes>\"$(awk '{ print $3 }' <<< $line)</rx-bytes>"
+    printf "<rx-bytes>$(awk '{ print $3 }' <<< $line)</rx-bytes>"
     printf "</rx>"
     printf "<tx>"
     printf "<tx-packets>$(awk '{ print $4 }' <<< $line)</tx-packets>"