Log: fencer: lower eligibility logs to info level

When the local fencer gets a fencing request, it logs at notice level like

Client ... wants to fence (reboot) ... using any device

Then every fencer goes through every registered device, logging messages like

... is eligible to fence (reboot) ...: static-list

The originating fencer will then log another notice-level message with the node
being asked to perform the fencing. The intermediate eligibility messages are
not interesting enough to clutter the main log, so downgrade them from notice
to info.