Set copy_function

Author: kou

src/afs.cc

@@ -578,7 +578,7 @@ static dshash_parameters SessionsParams = {
 	sizeof(SharedSessionData),
 	dshash_memcmp,
 	dshash_memhash,
-	0,  // Set later because this is determined dynamically.
+	dshash_memcpy,
 };
 
 struct SharedData {

test/helper/sandbox.rb

@@ -57,8 +57,8 @@ def read_command_output(input)
 
     def run_command(*args)
       pid, output_read, error_read = spawn_process(*args)
-      output = ""
-      error = ""
+      output = +""
+      error = +""
       status = nil
       timeout = 1
       loop do