dockerfiles: ENV DEBIAN_FRONTEND noninteractive

Setting DEBIAN_FRONTEND to noninteractive prevents apt from asking
questions when configuring packages.

Change-Id: I8c47ae133e85e0b61c7ac6035f8a75107c0a2177
Tuleap: #885

docker/Dockerfile_debian8

 FROM debian:8
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_debian8_i386

 FROM savoirfairelinux/ring-debian32:8
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_debian9

 FROM debian:stretch
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts

docker/Dockerfile_debian9_i386

 FROM savoirfairelinux/ring-debian32:9
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts

docker/Dockerfile_ubuntu14.04

 FROM ubuntu:14.04
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_ubuntu14.04_i386

 FROM savoirfairelinux/ring-ubuntu32:14.04
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_ubuntu15.10

 FROM ubuntu:15.10
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_ubuntu15.10_i386

 FROM savoirfairelinux/ring-ubuntu32:15.10
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_ubuntu16.04

 FROM ubuntu:16.04
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs

docker/Dockerfile_ubuntu16.04_i386

 FROM savoirfairelinux/ring-ubuntu32:16.04
 
+ENV DEBIAN_FRONTEND noninteractive
+
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y vim devscripts equivs