osbuilder: Drop Clear Linux

The Clear Linux rootfs is not being tested anywhere, and it seems Intel
doesn't have the capacity to review the PRs related to this (combined
with the lack of interested from the rest of the community on reviewing
PRs that are specific to this untested rootfs).

With this in mind, I'm suggesting we drop Clear Linux support and focus
on what we can actually maintain.

Signed-off-by: Fabiano Fidêncio <fabiano@fidencio.org>

tools/osbuilder/rootfs-builder/clearlinux/Dockerfile.in

@@ -1,40 +0,0 @@
-#
-# Copyright (c) 2018 Intel Corporation
-#
-# SPDX-License-Identifier: Apache-2.0
-
-ARG IMAGE_REGISTRY=docker.io
-FROM ${IMAGE_REGISTRY}/fedora:30
-
-@SET_PROXY@
-
-RUN dnf -y update && dnf install -y \
-    autoconf \
-    automake \
-    binutils \
-    chrony \
-    coreutils \
-    curl \
-    curl \
-    gcc \
-    gcc-c++ \
-    git \
-    glibc-common \
-    glibc-devel \
-    glibc-headers \
-    glibc-static \
-    glibc-utils \
-    libstdc++-devel \
-    libstdc++-static \
-    m4 \
-    make \
-    pkgconfig \
-    sed \
-    systemd \
-    tar \
-    vim \
-    which && \
-    dnf clean all
-
-# This will install the proper packages to build Kata components
-@INSTALL_RUST@

tools/osbuilder/rootfs-builder/clearlinux/config.sh

@@ -1,31 +0,0 @@
-#
-# Copyright (c) 2018 Intel Corporation
-#
-# SPDX-License-Identifier: Apache-2.0
-
-OS_NAME="Clear"
-REPO_NAME="clear"
-
-OS_VERSION=${OS_VERSION:-latest}
-
-clr_url="https://download.clearlinux.org"
-
-# resolve version
-[ "${OS_VERSION}" = "latest" ] && OS_VERSION=$(curl -sL "${clr_url}/latest")
-
-BASE_URL="${clr_url}/releases/${OS_VERSION}/${REPO_NAME}/${ARCH}/os/"
-
-PACKAGES="libudev0-shim kmod-bin iptables-bin"
-
-#Optional packages:
-# systemd: An init system that will start kata-agent if kata-agent
-#          itself is not configured as init process.
-[ "$AGENT_INIT" = "no" ] && PACKAGES+=" systemd chrony util-linux-bin" || true
-
-# Init process must be one of {systemd,kata-agent}
-INIT_PROCESS=systemd
-# List of zero or more architectures to exclude from build,
-# as reported by  `uname -m`
-ARCH_EXCLUDE_LIST=( aarch64 ppc64le s390x )
-
-[ "$SECCOMP" = "yes" ] && PACKAGES+=" libseccomp" || true

tools/osbuilder/rootfs-builder/rootfs.sh

@@ -795,9 +795,6 @@ detect_host_distro()
 		"*suse*")
 			distro="suse"
 			;;
-		"clear-linux-os")
-			distro="clearlinux"
-			;;
 		*)
 			distro="$ID"
 			;;