Bump steve to clean up resources created by kubectl shell [CI SKIP]

Dockerfile.dapper

@@ -19,7 +19,7 @@ ENV DOCKER_URL_amd64=https://get.docker.com/builds/Linux/x86_64/docker-1.10.3 \
     DOCKER_URL=DOCKER_URL_${ARCH}
 RUN wget -O - ${!DOCKER_URL} > /usr/bin/docker && chmod +x /usr/bin/docker
 
-ENV GIT_COMMIT="591cb7816f12c4936f355666fc8bf9b9f63fa806" \
+ENV GIT_COMMIT="d493afc3dbf4dd5f118fd069e5244caeaaecd6fb" \
     GIT_BRANCH="ke/v0.2" \
     GIT_SOURCE="/go/src/github.com/rancher/steve" \
     CATTLE_DASHBOARD_UI_VERSION="v2.6.7-rc5-kube-explorer-ui-rc2"