StopLRPInstance -> ActualLRP

Signed-off-by: Alex Suraci <asuraci@pivotal.io>
Support the ActualLRP lifecycle

Rework API

* Get & Delete for ActualsByProcessGuidAndIndex return a single instance
* Simplify the routes for actual lrp -> /v1/actual_lrps
* Fix the loggers

Actual LRP states are now strings
* add unclaimed, change starting to claimed

[#83638702]

Signed-off-by: Eric Malm <emalm@pivotal.io>
Set content type for client requests