docker: Sort Ubuntu packages

As recommended in https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#sort-multi-line-arguments

  "This helps to avoid duplication of packages and make the
  list much easier to update. This also makes PRs a lot easier
  to read and review."

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180818015344.797-4-f4bug@amsat.org>
Signed-off-by: Fam Zheng <famz@redhat.com>

tests/docker/dockerfiles/ubuntu.docker

@@ -2,16 +2,59 @@ FROM ubuntu:16.04
 RUN echo "deb http://archive.ubuntu.com/ubuntu/ trusty universe multiverse" >> \
     /etc/apt/sources.list
 ENV PACKAGES flex bison \
-    libusb-1.0-0-dev libiscsi-dev librados-dev libncurses5-dev libncursesw5-dev \
-    libseccomp-dev libgnutls-dev libssh2-1-dev  libspice-server-dev \
-    libspice-protocol-dev libnss3-dev libfdt-dev \
-    libgtk-3-dev libvte-2.91-dev libsdl2-dev libpng12-dev libpixman-1-dev \
-    libvdeplug-dev liblzo2-dev libsnappy-dev libbz2-dev libxen-dev librdmacm-dev libibverbs-dev \
-    libsasl2-dev libjpeg-turbo8-dev xfslibs-dev libcap-ng-dev libbrlapi-dev libcurl4-gnutls-dev \
-    libbluetooth-dev librbd-dev libaio-dev glusterfs-common libnuma-dev libepoxy-dev libdrm-dev libgbm-dev \
-    libjemalloc-dev libcacard-dev libusbredirhost-dev libnfs-dev libcap-dev libattr1-dev \
+    ccache \
+    clang \
+    gcc \
+    gettext \
+    git \
+    glusterfs-common \
+    libaio-dev \
+    libattr1-dev \
+    libbluetooth-dev \
+    libbrlapi-dev \
+    libbz2-dev \
+    libcacard-dev \
+    libcap-dev \
+    libcap-ng-dev \
+    libcurl4-gnutls-dev \
+    libdrm-dev \
+    libepoxy-dev \
+    libfdt-dev \
+    libgbm-dev \
+    libgnutls-dev \
+    libgtk-3-dev \
+    libibverbs-dev \
+    libiscsi-dev \
+    libjemalloc-dev \
+    libjpeg-turbo8-dev \
+    liblzo2-dev \
+    libncurses5-dev \
+    libncursesw5-dev \
+    libnfs-dev \
+    libnss3-dev \
+    libnuma-dev \
+    libpixman-1-dev \
+    libpng12-dev \
+    librados-dev \
+    librbd-dev \
+    librdmacm-dev \
+    libsasl2-dev \
+    libsdl2-dev \
+    libseccomp-dev \
+    libsnappy-dev \
+    libspice-protocol-dev \
+    libspice-server-dev \
+    libssh2-1-dev \
+    libusb-1.0-0-dev \
+    libusbredirhost-dev \
+    libvdeplug-dev \
+    libvte-2.91-dev \
+    libxen-dev \
+    make \
+    python-yaml \
+    sparse \
     texinfo \
-    gettext git make ccache python-yaml gcc clang sparse
+    xfslibs-dev
 RUN apt-get update && \
     apt-get -y install $PACKAGES
 RUN dpkg -l $PACKAGES | sort > /packages.txt