Delete python-docutils which I have no idea what requires it

doc/manual/installation.md

@@ -46,7 +46,7 @@ up-to-date and install it.
 
 Install the required packages (needed to compile Ruby and native extensions to Ruby gems):
 
-    sudo apt-get install -y runit build-essential git zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev libffi-dev curl openssh-server checkinstall libxml2-dev libxslt-dev libcurl4-openssl-dev libicu-dev logrotate python-docutils pkg-config cmake nodejs graphviz jq shared-mime-info
+    sudo apt-get install -y runit build-essential git zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev libffi-dev curl openssh-server checkinstall libxml2-dev libxslt-dev libcurl4-openssl-dev libicu-dev logrotate pkg-config cmake nodejs graphviz jq shared-mime-info
 
 
 ### Debian Stretch

docker/multi-process/scripts/standalone-packages

@@ -1,7 +1,6 @@
 export DEBIAN_FRONTEND=noninteractive
 apt-get update
-apt-get install -y python2.7 python-docutils mysql-server \
-                   supervisor python-pip && \
+apt-get install -y python3-pip mysql-server supervisor && \
 apt-get -y clean
 pip install supervisor-stdout
 rm -rf /var/lib/apt/lists/*