automation: remove python2 from opensuse images

The upcoming Leap 15.5 will come without a binary named 'python'.
Prepare the suse images for that change.

Starting with Xen 4.14 python3 can be used for build.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

automation/build/suse/opensuse-leap.dockerfile

@@ -58,8 +58,6 @@ RUN zypper install -y --no-recommends \
         'pkgconfig(libpci)' \
         'pkgconfig(sdl)' \
         'pkgconfig(sdl2)' \
-        python \
-        python-devel \
         python3-devel \
         systemd-devel \
         tar \

automation/build/suse/opensuse-tumbleweed.dockerfile

@@ -61,7 +61,6 @@ RUN zypper install -y --no-recommends \
         'pkgconfig(libpci)' \
         'pkgconfig(sdl)' \
         'pkgconfig(sdl2)' \
-        python-devel \
         python3-devel \
         systemd-devel \
         tar \