Changed default number of test machines to 3.

CircleCI keeps 10 nodes in order to speed up the build, but the default is 3, as this is the minimum required to run any test. This should make more sense as a default for a developer to quickly start an environment and iterate.

circle.yml

@@ -14,6 +14,7 @@ machine:
     PATH: $PATH:$HOME/.local/bin
     CLOUDSDK_CORE_DISABLE_PROMPTS: 1
     STATE: /home/ubuntu/state.env
+    NUM_HOSTS: 10
     # Base name of VMs for integration tests:
     NAME: test-$CIRCLE_BUILD_NUM-$CIRCLE_NODE_INDEX
     TEST_VMS_SETUP_OUTPUT_FILE: $CIRCLE_ARTIFACTS/test_vms_setup_output.txt

test/run-integration-tests.sh

@@ -24,7 +24,7 @@ APP="weave-net"
 PROJECT="weave-net-tests" # Only used when PROVIDER is gcp, by tools/provisioning/config.sh.
 NAME=${NAME:-"$(whoami | sed -e 's/[\.\_]*//g' | cut -c 1-4)"}
 PROVIDER=${PROVIDER:-gcp} # Provision using provided provider, or Google Cloud Platform by default.
-NUM_HOSTS=${NUM_HOSTS:-10}
+NUM_HOSTS=${NUM_HOSTS:-3}
 PLAYBOOK=${PLAYBOOK:-setup_weave-net_test.yml}
 TESTS=${TESTS:-}
 RUNNER_ARGS=${RUNNER_ARGS:-""}