Fixed typo in sanity check of weave's version (previously checking locally, now checking test host).

test/sanity_check.sh

@@ -22,6 +22,6 @@ for host in $HOSTS; do
     echo "# docker info"
     docker_on $host info
     echo "# weave version"
-    docker inspect -f {{.Created}} weaveworks/weave:${WEAVE_VERSION:-latest}
+    docker_on $host inspect -f {{.Created}} weaveworks/weave:${WEAVE_VERSION:-latest}
     weave_on $host version
 done