This object specifies the clear operation that an MC should
perform. A read on this object will return the last successful
clear operation performed by the master controller.
'none'
No clear operation was executed by MC since the time it
became operational. This is read-only.
'clearAll'
Specifies the MC to clear all prefixes in PfR master
database, connections to all border routers, and restart
the PfR master process.
'clearAllPrefixes'
Specifies the MC to clear all prefixes in PfR master
database.
'clearAllBorders'
Specifies the MC to clear connections to all border
routers.