[Tests] Enhancing end2end print
[Tests] Enhancing end2end print

The end2end print test has been extended with:
* Checking the created Object URL
* Testing JPEG
* Testing SVG
* Testing PDF

3liz/lizmap-web-client,rldhont/lizmap-web-client,laurentj/lizmap-web-client,rldhont/lizmap-web-client,laurentj/lizmap-web-client,nboisteault/lizmap-web-client,nboisteault/lizmap-web-client,nboisteault/lizmap-web-client,laurentj/lizmap-web-client,3liz/lizmap-web-client,nboisteault/lizmap-web-client,laurentj/lizmap-web-client,rldhont/lizmap-web-client,rldhont/lizmap-web-client,3liz/lizmap-web-client,3liz/lizmap-web-client