Description of problem:
Currently regression is skipping the tests for changes in some ignored files and saying regression is success. Some of these files can change the behaviour of the product and some test cases might be written considering the old values in those files. So regression needs to trigger the test cases for changes in the files which can change the behaviour of the product.

Here, is a similar case: 

This patch (https://review.gluster.org/#/c/19744/) changed the network.inode-lru-limit value from 50000 to 200000. Regression is success saying "Skipped tests for change that only modifies ignored files". This caused tests/basic/md-cache/bug-1418249.t test to fail in master because it was expecting the old value.

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