[contracts] no resource lock during seige #470

Job	Run time
setup-environment	16s
test-scarb-fmt	9s
test-various (combat)	45m 52s
test-various (buildings)	3m 7s
test-various (config)	3m 9s
test-various (hyperstructure)	15m 56s
test-various (bank)	33m 25s
test-various (map)	22m 10s
test-various (name)	7m 30s
test-various (resources)	42m 29s
test-various (trade)	40m 59s
test-various (realm)	28m 52s
test-various (guild)	44m 32s
test-various (transport)	30m 12s
test-various (models)	25m 43s
	5h 44m 21s

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