type: u32
help: RPKI cache polling period
val_help: u32:1-1300; Polling period

create: vtysh -c 'conf t' -c 'rpki' -c 'rpki polling_period $VAR(@)'
update: vtysh -c 'conf t' -c 'rpki' -c 'rpki polling_period $VAR(@)'
delete: vtysh -c 'conf t' -c 'rpki' -c 'no rpki polling_period'
