Don't fetch git histories in docker

Change-Id: I02e5db18d49d1978960ee3d66cb48d681e5e858e

Dockerfile

@@ -2,14 +2,13 @@ FROM ubuntu:latest
 
 ENV DEBIAN_FRONTEND noninteractive
 
-# update, upgrade and install basic packages
-RUN apt-get update && apt-get upgrade -y && apt-get clean
+# update, and install basic packages
+RUN apt-get update
 RUN apt-get install -y \
             build-essential \
             wget \
             git \
-            python \
-            subversion
+            python
 
 # install depot_tools http://www.chromium.org/developers/how-tos/install-depot-tools
 RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
@@ -19,9 +18,6 @@ ENV PATH /depot_tools:$PATH
 RUN mkdir edash_packager
 WORKDIR edash_packager
 RUN gclient config https://www.github.com/google/edash-packager.git --name=src
-RUN gclient sync
+RUN gclient sync --no-history
 RUN cd src && ninja -C out/Release
 ENV PATH /edash_packager/src/out/Release:$PATH
-
-# your media for testing
-RUN mkdir /medias