Autotest: Use the new test zone in all name-lookup unit tests

I also modified tst_QDnsLookup the test to use ';' as a separator as
opposed to spaces because I added MX and SRV records with multiple
RRs.

Partial cherry-pick from qtbase 36b253482fb7066409b266fbd482b6b93fe516e5
Change-Id: I62c7b6ad342c1bb23c4d9ac9730e35ab422e3ea2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>