Just for the record, I get the same snmp errors with OpenIPMI instead of nut.

# yum update --disablerepo=* --enablerepo=xcp-ng-base,xcp-ng-updates 
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Excluding mirror: updates.xcp-ng.org
 * xcp-ng-base: mirrors.xcp-ng.org
Excluding mirror: updates.xcp-ng.org
 * xcp-ng-updates: mirrors.xcp-ng.org
Resolving Dependencies
--> Running transaction check
---> Package net-snmp.x86_64 1:5.7.2-52.1.xcpng8.3 will be updated
---> Package net-snmp.x86_64 1:5.9.3-8.1.xcpng8.3 will be an update
---> Package net-snmp-agent-libs.x86_64 1:5.7.2-52.1.xcpng8.3 will be updated
---> Package net-snmp-agent-libs.x86_64 1:5.9.3-8.1.xcpng8.3 will be an update
---> Package net-snmp-libs.x86_64 1:5.7.2-52.1.xcpng8.3 will be updated
--> Processing Dependency: libnetsnmp.so.31()(64bit) for package: OpenIPMI-2.0.23-2.el7.x86_64
---> Package net-snmp-libs.x86_64 1:5.9.3-8.1.xcpng8.3 will be an update
--> Finished Dependency Resolution
Error: Package: OpenIPMI-2.0.23-2.el7.x86_64 (@xcp-ng-base)
           Requires: libnetsnmp.so.31()(64bit)
           Removing: 1:net-snmp-libs-5.7.2-52.1.xcpng8.3.x86_64 (@xcp-ng-updates)
               libnetsnmp.so.31()(64bit)
           Updated By: 1:net-snmp-libs-5.9.3-8.1.xcpng8.3.x86_64 (xcp-ng-updates)
              ~libnetsnmp.so.40()(64bit)
           Available: 1:net-snmp-libs-5.7.2-33.el7_5.2.x86_64 (xcp-ng-base)
               libnetsnmp.so.31()(64bit)
           Available: 1:net-snmp-libs-5.7.2-51.1.xcpng8.3.x86_64 (xcp-ng-base)
               libnetsnmp.so.31()(64bit)
           Available: 1:net-snmp-libs-5.7.2-51.2.xcpng8.3.x86_64 (xcp-ng-base)
               libnetsnmp.so.31()(64bit)
           Available: 1:net-snmp-libs-5.7.2-51.3.xcpng8.3.x86_64 (xcp-ng-base)
               libnetsnmp.so.31()(64bit)