- Merge libudev-devel into systemd-devel

- Make sure that libopenssl-devel is installed when building resolved. Openssl
was implictly pulled in by systemd-experimental subpackage but could be
missing if the build of this subpackage was disabled.

- resolved: disable fallback DNS servers and fail when no DNS server info could
be obtained from the links. It's better to let the sysadmin know that
something is likely misconfigured rather than silently handing over the DNS
queries to Google or Cloudflare.

- resolved: disable DNSSEC until the following issue is solved:
https://github.com/systemd/systemd/issues/10579
- Replace '%setup+%autopatch' with '%autosetup'

- systemd.spec: explicitely list all files for each main (sub) packages
Using glob patterns in %files section to reduce the number of listed files was
error-prone as some introduced files could silently be placed in the wrong
subpackage. The sections were also hard to read and many files needed to be
excluded from the main package making the point of glob pattern usage moot.
systemd, udev, systemd-container and systemd-network packages have now their
list of files described in a dedicated file. The lists are kept sorted to make
them easy to parse. The size of the files, especially the one for the main
package, is still reasonable and much easier to read now.
During this rework, a couple of cleanups happened: more use of
%{_systemd_util_dir}, some files was incorrectly owned by the main package and
have been moved to the correct sub-package, etc...
Note: the rest of the subpackages might be addressed later but let's find how
it goes for now.