bootseq_tests/bootseq_test fails in Savanna

[linh2931]

unittests/bootseq_tests.cpp(291): fatal error: in "bootseq_tests/bootseq_test": critical check active_schedule.producers.size() == 21 has failed
0 exception: unspecified
rethrow
    {}
    unit_test  bootseq_tests.cpp:341 test_method

unknown location(0): fatal error: in "bootseq_tests/bootseq_test": std::runtime_error: Caught Unexpected Exception
unittests/bootseq_tests.cpp(291): last checkpoint

[arhag]

Let's just remove this test from Spring. It covers system contracts behavior that do not belong here.

Instead it can be moved to the reference-contract tests. But that can be done later and is tracked by another issue: AntelopeIO/reference-contracts#89.