On RHEL 7, this package is named "pyOpenSSL", but on RHEL 8, Fedora, and
SUSE, it is named "python3-pyOpenSSL".
Prior to this change, the RHEL conditional was applying to both RHEL 7
and 8, so we would fail to resolve the "pyOpenSSL" package dependency on
RHEL 8.
Update the RPM conditionals to use "pyOpenSSL" on RHEL 7 and
"python3-pyOpenSSL" on all other distributions.