try a different means of purging stale connections

Signed-off-by: Daniel DeLeo <dan@chef.io>

integration/tests/cluster.sh

@@ -95,28 +95,31 @@ do_test_deploy() {
     # The backend will timeout pg connections after 5 minutes, which will
     # result in an EPIPE error in the services when they attempt to use the
     # dead connection. The inspec tests can't handle this and don't have an
-    # easy retry mechanism, so we restart the frontends before running tests.
+    # easy retry mechanism, so we create some throwaway tokens to work through
+    # busted connections.
     # Note that this disconnection isn't caused by automate-pg-gateway, which
     # we have tuned to be more tolerant of idle connections.
     # See also:
     # * https://github.com/lib/pq/issues/870
     # * https://github.com/lib/pq/pull/871
     # * https://github.com/lib/pq/issues/939
-    docker exec -t "$_frontend1_container_name"  "$cli_bin" restart-services
-    docker exec -t "$_frontend2_container_name"  "$cli_bin" restart-services
+    docker exec -t "$_frontend1_container_name" "$cli_bin" iam token create --admin "$(date +%s)" || true
+    docker exec -t "$_frontend1_container_name" "$cli_bin" iam token create --admin "$(date +%s)" || true
+    docker exec -t "$_frontend2_container_name" "$cli_bin" iam token create --admin "$(date +%s)" || true
+    docker exec -t "$_frontend2_container_name" "$cli_bin" iam token create --admin "$(date +%s)" || true
 
-    run_inspec_tests "${A2_ROOT_DIR}" "a2-iam-v2-integration"
     local admin_token
     admin_token=$(docker exec -t "$_frontend1_container_name" \
         "$cli_bin" iam token create --admin "diagnostics-test-$RANDOM")
 
     docker exec -t "$_frontend1_container_name" \
         "$cli_bin" diagnostics run --admin-token "$admin_token" "~iam-v1" "~applications"
 
-
     docker exec -t "$_frontend2_container_name" \
         "$cli_bin" diagnostics run --admin-token "$admin_token" "~iam-v1" "~applications"
 
+    run_inspec_tests "${A2_ROOT_DIR}" "a2-iam-v2-integration"
+
     "$cli_bin" diagnostics run --admin-token "$admin_token" "~iam-v1" "~purge" "~cli" "~grpc" "~deployment" "~applications"
 
 }