Add test to check if all resource files are accessible

This is to ensure that during testing any anomaly is caught before
deployement and an inaccessible file is being flagged.

@see https://gerrit.wikimedia.org/r/#/c/51273/

Change-Id: I150d5dc3beac38c0f0f15a4b053274c843186624
Merge "Add test to check if all resource files are accessible"