Declaring a rosbag::Bag member in a nodelet class leads to failure to launch the nodelet

Having a class member of type rosbag::Bag in a nodelet leads to failure to launch the nodelet in ROS melodic.
Here is a minimum example:
```cpp
#include <nodelet/nodelet.h>
#include <rosbag/bag.h>

class MyNodelet : public nodelet::Nodelet
{
 public:
  void onInit() {}

 private:
  rosbag::Bag bag_;
};

#include <pluginlib/class_list_macros.h>
PLUGINLIB_EXPORT_CLASS(MyNodelet, nodelet::Nodelet);
```
(Here is the full package: [my_package.tar.gz](https://github.com/ros/ros_comm/files/2264378/my_package.tar.gz))

Compiling and running
```
rosrun nodelet nodelet standalone my_package/MyNodelet
```
leads to the following error:
```
[ERROR] [1533595561.186295932]: Failed to load nodelet [/my_package_MyNodelet] of type [my_package/MyNodelet] even after refreshing the cache: MultiLibraryClassLoader: Could not create object of class type rosbag::NoEncryptor as no factory exists for it. Make sure that the library exists and was explicitly loaded through MultiLibraryClassLoader::loadLibrary()
[ERROR] [1533595561.187418380]: The error before refreshing the cache was: MultiLibraryClassLoader: Could not create object of class type rosbag::NoEncryptor as no factory exists for it. Make sure that the library exists and was explicitly loaded through MultiLibraryClassLoader::loadLibrary()
```
This used to work fine in lunar. It seems to be related to some recent changes to add encryption support in rosbag (https://github.com/ros/ros_comm/pull/1206).


Changing the member to be a pointer which is initialized in the `onInit` function works fine.

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Declaring a rosbag::Bag member in a nodelet class leads to failure to launch the nodelet #1474

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Declaring a rosbag::Bag member in a nodelet class leads to failure to launch the nodelet #1474

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