docs+lnrpc: rename rpc.proto to lightning.proto

To avoid a naming conflict with etcd, we rename our very generic
rpc.proto to lightning.proto to match the service name that's declared
within. This will break many external tutorials and possibly also our
API docs but the change needs to be done eventually.

docs/grpc/ruby.md

@@ -25,28 +25,28 @@ Clone the Google APIs repository:
 ⛰  git clone https://github.com/googleapis/googleapis.git
 ```
 
-Fetch the `rpc.proto` file (or copy it from your local source directory):
+Fetch the `lightning.proto` file (or copy it from your local source directory):
 
 ```shell
-⛰  curl -o rpc.proto -s https://raw.githubusercontent.com/lightningnetwork/lnd/master/lnrpc/rpc.proto
+⛰  curl -o lightning.proto -s https://raw.githubusercontent.com/lightningnetwork/lnd/master/lnrpc/lightning.proto
 ```
 
 Compile the proto file:
 
 ```shell
-⛰  grpc_tools_ruby_protoc --proto_path googleapis:. --ruby_out=. --grpc_out=. rpc.proto
+⛰  grpc_tools_ruby_protoc --proto_path googleapis:. --ruby_out=. --grpc_out=. lightning.proto
 ```
 
 Two files will be generated in the current directory: 
 
-* `rpc_pb.rb`
-* `rpc_services_pb.rb`
+* `lightning_pb.rb`
+* `lightning_services_pb.rb`
 
 ### Examples
 
 #### Simple client to display wallet balance
 
-Every time you use the Ruby gRPC you need to require the `rpc_services_pb` file.
+Every time you use the Ruby gRPC you need to require the `lightning_services_pb` file.
 
 We assume that `lnd` runs on the default `localhost:10009`.
 
@@ -58,7 +58,7 @@ We further assume you run `lnd` with `--no-macaroons`.
 $:.unshift(File.dirname(__FILE__))
 
 require 'grpc'
-require 'rpc_services_pb'
+require 'lightning_services_pb'
 
 # Due to updated ECDSA generated tls.cert we need to let gprc know that
 # we need to use that cipher suite otherwise there will be a handhsake
@@ -83,7 +83,7 @@ This will show the `total_balance` of the wallet.
 $:.unshift(File.dirname(__FILE__))
 
 require 'grpc'
-require 'rpc_services_pb'
+require 'lightning_services_pb'
 
 ENV['GRPC_SSL_CIPHER_SUITES'] = "HIGH+ECDSA"