tmpfiles: use common macro for a set of specifiers

This adds %q, %A and %M specifiers to tmpfiles:
- %A and %M were previously added to tmpfiles.d man page, but not to specifier_table
- %q is added via COMMON_SYSTEM_SPECIFIERS

test/units/TEST-22-TMPFILES.20.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# Test specifiers
+set -eux
+
+rm -rf /tmp/specifiers
+
+root='/tmp/specifiers/root'
+mkdir -p $root/etc
+cat >$root/etc/os-release <<EOF
+ID=the-id
+BUILD_ID=build-id
+VARIANT_ID=variant-id
+VERSION_ID=version-id
+IMAGE_ID=image-id
+IMAGE_VERSION=22
+EOF
+
+systemd-tmpfiles --create - --root=$root <<EOF
+f  /os-release2 - - - - ID=%o\n
+w+ /os-release2 - - - - BUILD_ID=%B\n
+w+ /os-release2 - - - - VARIANT_ID=%W\n
+w+ /os-release2 - - - - VERSION_ID=%w\n
+w+ /os-release2 - - - - IMAGE_ID=%M\n
+w+ /os-release2 - - - - IMAGE_VERSION=%A\n
+EOF
+
+diff $root/etc/os-release $root/os-release2