Since the last HP-HEALTH version 10.70 that you can find under:
https://downloads.linux.hpe.com/SDR/repo/spp/2018.03.0/packages/
You can download the two following packages:
hp-health-10.70-1846.6.rhel7.x86_64
hp-snmp-agents-10.70-2962.5.rhel7.x86_64
and then install them:
yum install ./hp-health-10.70-1846.6.rhel7.x86_64.rpm hp-snmp-agents-10.70-2962.5.rhel7.x86_64.rpm
/bin/systemctl restart hp-snmp-agents.service
and the hplog command work fine after!