Added a missing result file to the rocksdb_sys_vars result suite

storage/rocksdb/mysql-test/rocksdb_sys_vars/include/rocksdb_sys_var.inc

@@ -10,6 +10,7 @@
 --eval SET @start_global_value = @@global.$sys_var
 if (!$suppress_default_value)
 {
+  --replace_regex /[a-f0-9]{40}/#/
   SELECT @start_global_value;
   if ($session)
   {

storage/rocksdb/mysql-test/rocksdb_sys_vars/r/rocksdb_git_hash_basic.result

+SET @start_global_value = @@global.ROCKSDB_GIT_HASH;
+SELECT @start_global_value;
+@start_global_value
+#
+"Trying to set variable @@global.ROCKSDB_GIT_HASH to 444. It should fail because it is readonly."
+SET @@global.ROCKSDB_GIT_HASH   = 444;
+ERROR HY000: Variable 'rocksdb_git_hash' is a read only variable