chore(rootfs/Dockerfile): upgrade to glide v0.11.1

See https://github.com/Masterminds/glide/releases/tag/v0.11.1

Author: mboersma

rootfs/Dockerfile

@@ -1,6 +1,6 @@
 FROM golang:1.6.2
 
-ENV GLIDE_VERSION=v0.11.0 GLIDE_HOME=/root GO15VENDOREXPERIMENT=1
+ENV GLIDE_VERSION=v0.11.1 GLIDE_HOME=/root GO15VENDOREXPERIMENT=1
 
 RUN apt-get update && apt-get install -y \
   jq \