Don't compile ldb tool into static library

Summary:
This is first step of my effort to reduce size of librocksdb.a for use in mobile.

ldb object files are huge and are ment to be used as a command line tool. I moved them to `tools/` directory and include them only when compiling `ldb`

This diff reduced librocksdb.a from 42MB to 39MB on my mac (not stripped).

Test Plan: ran ldb

Reviewers: dhruba, haobo, sdong, ljin, yhchiang

Reviewed By: yhchiang

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17823

tools/ldb_cmd_execute_result.h

@@ -0,0 +1,76 @@
+//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+#pragma once
+
+namespace rocksdb {
+
+class LDBCommandExecuteResult {
+public:
+  enum State {
+    EXEC_NOT_STARTED = 0, EXEC_SUCCEED = 1, EXEC_FAILED = 2,
+  };
+
+  LDBCommandExecuteResult() {
+    state_ = EXEC_NOT_STARTED;
+    message_ = "";
+  }
+
+  LDBCommandExecuteResult(State state, std::string& msg) {
+    state_ = state;
+    message_ = msg;
+  }
+
+  std::string ToString() {
+    std::string ret;
+    switch (state_) {
+    case EXEC_SUCCEED:
+      break;
+    case EXEC_FAILED:
+      ret.append("Failed: ");
+      break;
+    case EXEC_NOT_STARTED:
+      ret.append("Not started: ");
+    }
+    if (!message_.empty()) {
+      ret.append(message_);
+    }
+    return ret;
+  }
+
+  void Reset() {
+    state_ = EXEC_NOT_STARTED;
+    message_ = "";
+  }
+
+  bool IsSucceed() {
+    return state_ == EXEC_SUCCEED;
+  }
+
+  bool IsNotStarted() {
+    return state_ == EXEC_NOT_STARTED;
+  }
+
+  bool IsFailed() {
+    return state_ == EXEC_FAILED;
+  }
+
+  static LDBCommandExecuteResult SUCCEED(std::string msg) {
+    return LDBCommandExecuteResult(EXEC_SUCCEED, msg);
+  }
+
+  static LDBCommandExecuteResult FAILED(std::string msg) {
+    return LDBCommandExecuteResult(EXEC_FAILED, msg);
+  }
+
+private:
+  State state_;
+  std::string message_;
+
+  bool operator==(const LDBCommandExecuteResult&);
+  bool operator!=(const LDBCommandExecuteResult&);
+};
+
+}