test: initial refactor to support running in parallel in an unshare

The release suite fails with no permissions to dump loopback, so let's
run tests in an unshare, one per test, with and start as many syslogd as
needed for each test -- also easier to debug since all are then fully
stand-alone.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/start.sh

@@ -4,6 +4,54 @@ if [ x"${srcdir}" = x ]; then
 fi
 . ${srcdir}/test.rc
 
+# Print heading for test phases
+print()
+{
+    printf "\e[7m>> %-76s\e[0m\n" "$1"
+}
+
+dprint()
+{
+    printf "\e[2m%-76s\e[0m\n" "$1"
+}
+
+SKIP()
+{
+    print "TEST: SKIP"
+    [ $# -gt 0 ] && echo "$*"
+    exit 77
+}
+
+FAIL()
+{
+    print "TEST: FAIL"
+    [ $# -gt 0 ] && echo "$*"
+    exit 99
+}
+
+OK()
+{
+    print "TEST: OK"
+    [ $# -gt 0 ] && echo "$*"
+    exit 0
+}
+
+# shellcheck disable=SC2068
+tenacious()
+{
+    timeout=$1
+    shift
+
+    while [ $timeout -gt 0 ]; do
+	$@ && return
+	timeout=$((timeout - 1))
+    done
+
+    FAIL "Timeed out $*"
+}
+
+ip link set lo up
+
 mkdir -p ${CONFD}
 cat <<EOF > ${CONF}
 # Nothing here yo