Change CircleCI config to 2.0 version

Environment variables are moved out to a script, because CircleCI 2.0
does not support expansion of '$foo' in 'env' section.

bin/circle-destroy-vms

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -e
+
+source "$SRCDIR/bin/circle-env"
+cd "$SRCDIR/test"
+./run-integration-tests.sh destroy

bin/circle-env

@@ -0,0 +1,12 @@
+# Set environment variables here because CircleCI can't expand $FOO in 'env' section
+
+export PATH="$PATH:$HOME/.local/bin:/opt/google-cloud-sdk/bin"
+export CLOUDSDK_CORE_DISABLE_PROMPTS=1
+# Base name of VMs for integration tests:
+export NAME=test-$CIRCLE_BUILD_NUM-$CIRCLE_NODE_INDEX
+export TEST_VMS_SETUP_OUTPUT_FILE=$CIRCLE_ARTIFACTS/test_vms_setup_output.txt
+export TEST_VMS_PROV_AND_CONF_LOCK_FILE=$CIRCLE_ARTIFACTS/test_vms_provisioned_and_configured.txt
+export TEST_VMS_READY_LOCK_FILE=$CIRCLE_ARTIFACTS/test_vms_ready.txt
+# Google Cloud Platorm images for integration tests:
+export USE_IMAGE=1
+export DISK_NAME_PREFIX=test-$CIRCLE_BUILD_NUM-0

bin/circle-test-pre

@@ -16,6 +16,8 @@ source "$(dirname "$0")/wait_for.sh"
     exit 1
 }
 
+source "$SRCDIR/bin/circle-env"
+
 # Provisioning from image typically take 90 seconds, 
 # but if we are creating a GCP image, it can take more than 10 minutes:
 wait_for 900 "$TEST_VMS_PROV_AND_CONF_LOCK_FILE"

bin/circle-test-smoke

@@ -9,6 +9,8 @@ source "$(dirname "$0")/wait_for.sh"
     exit 1
 }
 
+source "$SRCDIR/bin/circle-env"
+
 # Provisioning from image typically take 90 seconds, 
 # but if we are creating a GCP image, it can take more than 10 minutes:
 wait_for 900 "$TEST_VMS_READY_LOCK_FILE"

bin/provision_test_vms.sh

@@ -18,7 +18,6 @@ function install_ansible() {
     sudo apt-get install -qq -y python-pip python-dev libffi-dev libssl-dev \
         && pip install --user -U setuptools cffi \
         && pip install --user ansible
-    export PATH="$PATH:$HOME/.local/bin"
 }
 
 [ -n "$SECRET_KEY" ] || {
@@ -26,6 +25,8 @@ function install_ansible() {
     exit 1
 }
 
+source "$SRCDIR/bin/circle-env"
+
 install_terraform >>"$TEST_VMS_SETUP_OUTPUT_FILE" 2>&1
 install_ansible >>"$TEST_VMS_SETUP_OUTPUT_FILE" 2>&1