IBX-8891: Fixed XML link validation to allow using `tel:` in links (#… #159

Job	Run time
Solr integration tests	1m 4s
Run code style check (8.0)	2m 38s
Tests (7.3)	2m 55s
Tests (7.4)	2m 47s
Tests (8.0)	31s
Tests (8.1)	2m 45s
PostgreSQL integration tests (7.4)	1m 0s
MySQL integration tests (7.4)	1m 7s
PostgreSQL integration tests (8.0)	54s
MySQL integration tests (8.0)	1m 12s
PostgreSQL integration tests (8.1)	56s
MySQL integration tests (8.1)	1m 17s
	19m 6s

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