Add generated client and server for Superviser

Add generated client and server for Superviser

It uses go-rpcgen which can be installed with the following command:
    go get github.com/alecthomas/go-rpcgen

Command used to generate RPC stubs:
    go-rpcgen --source=boruta.go --type=Superviser \
        --target=rpc/superviser/superviser.go \
        --package=superviser \
        --imports "net/rpc",".=git.tizen.org/tools/boruta"

Change-Id: Ia6d327d847a4b2c80b4a1458dc30f862b2dded51
Reviewed-on: https://mcdsrvbld02.digital.local/review/49764
Reviewed-by: Maciej Wereski <m.wereski@partner.samsung.com>
Tested-by: Maciej Wereski <m.wereski@partner.samsung.com>