Both (ETSI) PreCAC and RCAC are going to use use the same state
machine. The state machine drives the Agile engine and not very specific
to RCAC or PreCAC, therefore let the state machine be called agile state
machine and change the names of all the associated variables accordingly.
In this preparatory change, modify names of all APIs, states and events
to make them common to Agile RCAC and Agile PreCAC
Change-Id: I83835e0295bc97e1099c0e01fc6b2fce62437872
490187bdcd