test: namespace cleanup, common -> src, tenv -> lib, etc.

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

test/setup-sysroot.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -eu
+
+# shellcheck disable=SC2154
+make -C "$top_builddir" DESTDIR="$SYSROOT" install
+
+mkdir -p "$SYSROOT/sbin/"
+cp "$top_builddir/test/src/serv" "$SYSROOT/sbin/"
+
+# shellcheck disable=SC2154
+FINITBIN="$(pwd)/$top_builddir/src/finit" DEST="$SYSROOT" make -f "$srcdir/lib/sysroot.mk"
+
+# Drop plugins we don't need in test, only causes confusing FAIL in logs.
+for plugin in tty.so urandom.so rtc.so modprobe.so hotplug.so; do
+	find "$SYSROOT" -name $plugin -delete
+done