Merge pull request #4345 from murgatroid99/ruby_interop_bytes_encoding

Fix encoding for bytes fields in ruby interop client

src/ruby/pb/test/client.rb

@@ -160,7 +160,7 @@ end
 # produces a string of null chars (\0) of length l.
 def nulls(l)
   fail 'requires #{l} to be +ve' if l < 0
-  [].pack('x' * l).force_encoding('utf-8')
+  [].pack('x' * l).force_encoding('ascii-8bit')
 end
 
 # a PingPongPlayer implements the ping pong bidi test.

src/ruby/pb/test/server.rb

@@ -126,7 +126,7 @@ end
 # produces a string of null chars (\0) of length l.
 def nulls(l)
   fail 'requires #{l} to be +ve' if l < 0
-  [].pack('x' * l).force_encoding('utf-8')
+  [].pack('x' * l).force_encoding('ascii-8bit')
 end
 
 # A EnumeratorQueue wraps a Queue yielding the items added to it via each_item.