add systemd git

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
oeqa: Update systemd tests to newer systemd behaviour

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
lib/oe/rootfs: Fix LDCONFIGDEPEND check

We shouldn't be running this if it expands to None or "" or False
so update the code accordingly.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>