test: trim the fat from test Dockerfile (#394)

Signed-off-by: awphi <26072111+awphi@users.noreply.github.com>

Author: awphi

internal/testutil/dind/Dockerfile

@@ -6,13 +6,8 @@ RUN echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config && \
     echo "PermitEmptyPasswords yes" >> /etc/ssh/sshd_config && \
     echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && \
     echo "KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org" >> /etc/ssh/sshd_config && \
-    echo "DisableForwarding no" >> /etc/ssh/sshd_config && \
-    echo "PermitOpen any" >> /etc/ssh/sshd_config && \
-    echo "PermitListen any" >> /etc/ssh/sshd_config && \
-    echo "" >> /etc/ssh/sshd_config && \
     echo "Match all" >> /etc/ssh/sshd_config && \
-    echo "    AllowTcpForwarding yes" >> /etc/ssh/sshd_config && \
-    echo "    DisableForwarding no" >> /etc/ssh/sshd_config
+    echo "    AllowTcpForwarding yes" >> /etc/ssh/sshd_config
 
 RUN passwd -d root
 RUN ssh-keygen -A

internal/testutil/passwordless-ssh/Dockerfile

@@ -5,14 +5,7 @@ RUN apk add --no-cache openssh-server
 RUN echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config && \
     echo "PermitEmptyPasswords yes" >> /etc/ssh/sshd_config && \
     echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && \
-    echo "KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org" >> /etc/ssh/sshd_config && \
-    echo "DisableForwarding no" >> /etc/ssh/sshd_config && \
-    echo "PermitOpen any" >> /etc/ssh/sshd_config && \
-    echo "PermitListen any" >> /etc/ssh/sshd_config && \
-    echo "" >> /etc/ssh/sshd_config && \
-    echo "Match all" >> /etc/ssh/sshd_config && \
-    echo "    AllowTcpForwarding yes" >> /etc/ssh/sshd_config && \
-    echo "    DisableForwarding no" >> /etc/ssh/sshd_config
+    echo "KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org" >> /etc/ssh/sshd_config
 
 RUN passwd -d root
 RUN ssh-keygen -A