travis: Switch to docker based builds

This requires to have distro specific install scripts and build.sh
script.

For now ibmswtpm2 is compiled just for native builds (depends on gcc,
compiled natively). libtmps/swtpm could be used.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Bruno Meneguele <bmeneg@redhat.com>(Fedora,CentOS 8(RHEL actually))
[zohar@linux.ibm.com: removed debugging in travis/fedora.sh]
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

travis/fedora.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+# Copyright (c) 2020 Petr Vorel <pvorel@suse.cz>
+set -e
+
+if [ -z "$CC" ]; then
+	echo "missing \$CC!" >&2
+	exit 1
+fi
+
+case "$TSS" in
+ibmtss) TSS="tss2-devel";;
+tpm2-tss) TSS="tpm2-tss-devel";;
+'') echo "Missing TSS!" >&2; exit 1;;
+*) echo "Unsupported TSS: '$TSS'!" >&2; exit 1;;
+esac
+
+# ibmswtpm2 requires gcc
+[ "$CC" = "gcc" ] || CC="gcc $CC"
+
+yum -y install \
+	$CC $TSS \
+	asciidoc \
+	attr \
+	autoconf \
+	automake \
+	diffutils \
+	docbook-xsl \
+	gzip \
+	keyutils-libs-devel \
+	libattr-devel \
+	libtool \
+	libxslt \
+	make \
+	openssl \
+	openssl-devel \
+	pkg-config \
+	procps \
+	sudo \
+	vim-common \
+	wget \
+	which
+
+yum -y install docbook5-style-xsl || true