rpm: add support for openEuler

rpm: add support for openEuler

OpenEuler uses the same package manager DNF as RHEL/Fedora. And
it is similar to RHEL/Fedora.

OpenEuler Linux is becoming the mainstream Linux distro in China.
So adding support for it makes sense for the users. For more
details about it see: https://www.openeuler.org/en/.

Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Damian Szuberski <szuberskidamian@gmail.com>
Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>
Closes #14222