Allow disabling of FIXTURES_REQUIRED for qmtests

Rosen Matevrequested to merge
rmatev/Gaudi:allow-disable-fixtures into master

If QMTEST_DISABLE_FIXTURES_REQUIRED is truthy, a failing prerequisite test will not cause the test depending on it to be skipped.

Workaround for #216 (closed)

Needed for lhcb-core/LHCbNightlyConf!1025 (merged)

Edited by Rosen Matev

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