Fix the assignment / usage of OC0 environmental variable so

now it is allowed / handled.

@@ -67,14 +67,14 @@ function cell {
         [ ! -f $ONOS_ROOT/tools/test/cells/$1 ] && \
             echo "No such cell: $1" >&2 && return 1
         unset ONOS_CELL ONOS_NIC ONOS_FEATURES
-        unset OC1 OC2 OC3 OC4 OC5 OC6 OC7 OC8 OC9 OCN OCI
+        unset OC0 OC1 OC2 OC3 OC4 OC5 OC6 OC7 OC8 OC9 OCN OCI
         export ONOS_CELL=$1
         . $ONOS_ROOT/tools/test/cells/$1
         cell
     else
         env | egrep "ONOS_CELL"
         env | egrep "OCI"
-        env | egrep "OC[1-9]+" | sort
+        env | egrep "OC[0-9]+" | sort
         env | egrep "OCN"
         env | egrep "ONOS_" | egrep -v 'ONOS_ROOT|ONOS_CELL'
     fi

@@ -42,7 +42,7 @@ fi
 
 echo "ONOS_CELL=${ONOS_CELL}"
 echo "ONOS_NIC=${ONOS_NIC}"
-for n in {1..9}; do
+for n in {0..9}; do
     ocn="OC${n}"
     if [ -n "${!ocn}" ]; then
         echo "$ocn=${!ocn}"