e2e: remove docker engine testing remnants

These changes were made as part of the `docker engine` feature
in commit fd2f1b3b6650b53ed1367b84910e0f81e89220cd, but later
reverted in f250152bf4932375fd279a4a8f27ca721cbaa948 and
b7ec4a42d900c631d912b1ea8493752ee534b15f

These lines were forgotten to be removed, and should no longer
be needed.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit de01e72455433f6befee371e8e83ad5f83270461)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: be9adbd5c122c8fc98f943f3a4f25904244af623
Component: cli

Author: thaJeztah

components/cli/dockerfiles/Dockerfile.e2e

@@ -1,18 +1,12 @@
 ARG GO_VERSION=1.12.8
 
-FROM docker/containerd-shim-process:a4d1531 AS containerd-shim-process
-
 # Use Debian based image as docker-compose requires glibc.
 FROM golang:${GO_VERSION}
 
 RUN apt-get update && apt-get install -y \
     build-essential \
     curl \
     openssl \
-    btrfs-tools \
-    libapparmor-dev \
-    libseccomp-dev \
-    iptables \
     openssh-client \
     && rm -rf /var/lib/apt/lists/*