Add automake in dockerfile

doc/getstarted/build_and_install/build_from_source_en.md

@@ -101,8 +101,8 @@ As a simple example, consider the following:
     ```bash
     # necessary
     sudo apt-get update
-    sudo apt-get install -y git curl gcc g++ gfortran make build-essential
-    sudo apt-get install -y python python-pip python-numpy libpython-dev
+    sudo apt-get install -y git curl gcc g++ gfortran make build-essential autotools-dev
+    sudo apt-get install -y python python-pip python-numpy libpython-dev automake
     sudo pip install 'protobuf==3.1.0.post1'
 
     # install cmake 3.4

paddle/scripts/docker/Dockerfile

@@ -10,6 +10,7 @@ RUN apt-get update && \
     apt-get install -y wget unzip tar xz-utils bzip2 gzip coreutils && \
     apt-get install -y curl sed grep graphviz libjpeg-dev zlib1g-dev && \
     apt-get install -y python-numpy python-matplotlib gcc g++ gfortran && \
+    apt-get install -y autotools-dev automake && \
     apt-get clean -y
 
 RUN pip install --upgrade pip && \ 

paddle/scripts/docker/Dockerfile.gpu

@@ -10,6 +10,7 @@ RUN apt-get update && \
     apt-get install -y wget unzip tar xz-utils bzip2 gzip coreutils && \
     apt-get install -y curl sed grep graphviz libjpeg-dev zlib1g-dev && \
     apt-get install -y python-numpy python-matplotlib gcc g++ gfortran && \
+    apt-get install -y autotools-dev automake && \
     apt-get clean -y
 
 RUN pip install --upgrade pip && \