Tweak the amount of retries when trying to get a node from cico

There are temporary heavier rate limiting on cico due to a misbehaving
tenant, let's put some retries in place to alleviate the issues with
getting nodes.
Since the rate limiting is based on "amount of nodes per 5 minutes",
let's retry for at least 6 minutes before giving up.

Change-Id: I56325578e176f4e5e3bb01f7d411c133f35f87b7

ci-scripts/get-node.sh

@@ -18,8 +18,8 @@ popd
 $WORKSPACE/bin/cico node get --arch x86_64 \
               --release 7 \
               --count 1 \
-              --retry-count 2 \
-              --retry-interval 30 \
+              --retry-count 6 \
+              --retry-interval 60 \
               -f csv > $WORKSPACE/provisioned.csv
 
 $WORKSPACE/bin/cico inventory