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Currently, to run the integration tests, it's still necessary to install various other build tools besides meson: A compiler, gperf, libcap, ... which we want to avoid in CI systems where we receive prebuilt systemd packages and only want to test them. Examples are Debian's autopkgtest CI and Fedora CI. Let's make it possible for these systems to run the integration tests without having to install any other build dependency besides meson by extracting the logic required to run the integration tests with meson into a separate subdirectory and adding a standalone top-level meson.build file which can be used to configure a meson tree with as its only purpose running the integration tests. Practically, we do the following: - all the integration test directories and integration-test-wrapper.py are moved from test/ to test/integration-test/. - All the installation logic is kept out of test/integration-test/ or any of its subdirectories and moved into test/meson.build instead. - We add test/integration-test/standalone/meson.build to run the integration tests standalone. This meson file includes test/integration-test via a cute symlink hack to trick meson into including a parent directory with subdir(). - Documentation is included on how to use the new standalone mode. - TEST-64-UDEV-STORAGE and TEST-85-NETWORK are changed to generate separate units for each testcase to make them behave more like the other integration tests.