Fix for images in system.xml with config_path

[gonzaloebiz]

In the system.xml if you put a field of type="image" and specify a config_path like this:

Popup Image
<backend_model>Magento\Config\Model\Config\Backend\Image</backend_model>
<upload_dir config="system/filesystem/media" scope_info="1">sales/payment/ebizmarts</upload_dir>
<base_url type="media" scope_info="1">sales/payment/ebizmarts</base_url>
<config_path>payment/ebizmarts/popup_image</config_path>

that not works.
This patch fix this

[Vinai]

Thank you for the PR! We are currently waiting for the travis builds to work again, which should happen in a few days. Once that is running and the tests are green we can continue to process your contribution. In the mean time, can you please sign the contributor license agreement?

[gonzaloebiz]

Done, the license agreement is signed

[mazhalai]

@gonzaloebiz Please merge latest from develop and rerun builds.

[dsikkema-magento]

@gonzaloebiz could you go ahead an re-launch the builds please, after merging latest?
Internal ticket created: MAGETWO-49872

[gonzaloebiz]

Sorry i don't understand what you want, can you explain it?

[Zatara7]

@gonzaloebiz what dskikema meant is to merge latest code from develop branch of magento2 and push it to your branch that you started the PR from. This will trigger the Travis CI builds "continuous-integration/travis-ci/pr"