docker: Resolve partial update problem in Tumbleweed image.

This resolves the following error:

  ImportError: /usr/lib64/libgobject-2.0.so.0: undefined symbol:
  g_memdup2

* docker/Dockerfile_opensuse-tumbleweed: Do not update and install
stuff in various steps.
* docker/Dockerfile_opensuse-leap_15.2: Likewise.

Change-Id: I286576cddd5226cf40fd1bec997be36b2142e355

docker/Dockerfile_opensuse-leap_15.2

 FROM opensuse/leap:15.2
-RUN zypper --non-interactive install  dnf
-RUN dnf clean all
-RUN zypper --non-interactive lr
-RUN zypper --non-interactive  --gpg-auto-import-keys refresh
-RUN zypper --non-interactive lr
-RUN zypper --non-interactive  install -y dnf-command\(builddep\) rpmdevtools
 
-RUN zypper --non-interactive clean
-RUN zypper --non-interactive up -y && \
-    zypper --non-interactive install -y  Mesa-dri-devel Mesa-dri && \
-    zypper --non-interactive install -y libinput-devel && \
-    zypper --non-interactive install -y \
+RUN zypper --non-interactive install -y \
+        dnf \
+        dnf-command\(builddep\) \
+        rpmdevtools \
+        Mesa-dri-devel Mesa-dri \
         git \
         gcc8 \
         gcc8-c++ \

docker/Dockerfile_opensuse-tumbleweed

 FROM opensuse/tumbleweed
-RUN zypper --non-interactive install  dnf
-RUN dnf clean all
-RUN zypper --non-interactive lr
-RUN zypper --non-interactive  --gpg-auto-import-keys refresh
-RUN zypper --non-interactive lr
-RUN zypper --non-interactive  install -y dnf-command\(builddep\) rpmdevtools
 
-RUN zypper --non-interactive clean
-RUN zypper --non-interactive up -y && \
-    zypper --non-interactive install -y  Mesa-dri-devel Mesa-dri && \
-    zypper --non-interactive install -y libinput-devel && \
-    zypper --non-interactive install -y \
+RUN zypper --non-interactive install -y \
+        dnf \
+        dnf-command\(builddep\) \
+        rpmdevtools \
+        Mesa-dri-devel Mesa-dri \
+        libinput-devel \
         git \
         rpm-build \
         tar \