Sanity checks' output is now redirected to $CIRCLE_ARTIFACTS directly when running smoke tests in CircleCI.

Previously sanity checks' output was redirected to /tmp and then copied to $CIRCLE_ARTIFACTS, which is more "moving pieces".

bin/circle-test-smoke

@@ -9,7 +9,6 @@ if [ -n "$TEST_AND_PUBLISH" ] ; then
     cd $SRCDIR/test
     eval $(./gce.sh hosts)
     export COVERAGE=true
-    export WEAVE_NET_SANITY_CHECKS_FILES="/tmp/weave_net_sanity_check_*.log"
+    export WEAVE_NET_SANITY_CHECKS_FILES="$CIRCLE_ARTIFACTS/weave_net_sanity_check_*.log"
     ./run_all.sh
-    cp $WEAVE_NET_SANITY_CHECKS_FILES $CIRCLE_ARTIFACTS
 fi