Specifiy ActionTp path relatively.

This is a trial to fix the following TravisCI's error.

  testActionManager::test_execCommandAction:		[ERR] <ActionManager.cc:309> Failed to execute command: Failed to execute child process "ActionTp" (No such file or directory), action ID: 2343242
F
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Failure: testActionManager::test_execCommandAction
<true == ctx->dbAction.getLog(ctx->actionLog, ctx->actorInfo.logId)>
expected: <1>
  actual: <0>
./testActionManager.cc:233: void testActionManager::_assertActionLogJustAfterExec(testActionManager::ExecCommandContext*): cppcut_assert_equal(true, ctx->dbAction.getLog(ctx->actionLog, ctx->actorInfo.logId), )
./testActionManager.cc:366: void testActionManager::test_execCommandAction(): _assertActionLogJustAfterExec(ctx)
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