make i local

This prevents bleed out of the i variable to other functions that
might call this inside their own iteration loop.

Change-Id: I42d0c287a6f4bb24ae3871de9abb7e0de98a8462

lib/ironic

@@ -559,6 +559,7 @@ function wait_for_nova_resources {
     # timing out.
     local resource=$1
     local expected_count=$2
+    local i
     echo_summary "Waiting 2 minutes for Nova resource tracker to pick up $resource >= $expected_count"
     for i in $(seq 1 120); do
         if [ $(nova hypervisor-stats | grep " $resource " | get_field 2) -ge $expected_count ]; then