Dockerfile: Update package list according to Yocto 3.0 essential needs

Move those needs to top at this chance and refactor the rest. The net
additions are:

 - python3-pexpect
 - debianutils
 - iputils-ping
 - python3-git
 - python3-jinja2
 - libegl1-mesa
 - libsdl1.2-dev
 - pylint3
 - xterm

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

Dockerfile

@@ -10,14 +10,14 @@ RUN apt-get update && \
 ENV LANG=en_US.utf8
 
 RUN apt-get install --no-install-recommends -y \
-                       gawk wget git-core diffstat unzip file \
-                       texinfo gcc-multilib build-essential \
-                       chrpath socat cpio python python3 rsync \
-                       tar bzip2 curl dosfstools mtools parted \
-                       syslinux tree python3-pip bc python3-yaml \
-                       lsb-release python3-setuptools ssh-client \
-                       vim less mercurial iproute2 xz-utils gnupg \
-                       tmux libncurses-dev python3-wheel git-lfs && \
+        gawk wget git-core diffstat unzip texinfo gcc-multilib \
+        build-essential chrpath socat cpio python python3 python3-pip python3-pexpect \
+        xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev \
+        pylint3 xterm \
+        python3-setuptools python3-wheel python3-yaml \
+        lsb-release file vim less tree tar bzip2 bc tmux libncurses-dev \
+        dosfstools mtools parted syslinux \
+        git-lfs mercurial iproute2 ssh-client curl rsync gnupg && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*