[programming][packaging] Handle udevadm commands in RPM specs on rpm-ostree distros and containers

[LukeShortCloud]

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See if the udevd socket is available.

# skip retriggering if udevd isn't even accessible, e.g. containers or
# rpm-ostree-based systems
if [ -S /run/udev/control ]; then
    udevadm control --reload
    udevadm trigger
fi

https://src.fedoraproject.org/rpms/udisks2/pull-request/3#request_diff https://github.com/fedora-silverblue/issue-tracker/issues/16