Add Spring.allow_reloading_disabled opt-in #346

Job	Run time
tests (3.1, 7.2)	6m 35s
tests (3.2, 7.2)	6m 5s
tests (3.1, 7.1)	5m 51s
tests (3.3, 7.1)	5m 57s
tests (3.2, 8.0)	6m 39s
tests (3.3, edge)	11s
tests (3.3, 8.0)	6m 46s
tests (3.3, 7.2)	6m 41s
tests (3.2, 8.1)	6m 29s
tests (3.3, 8.1)	6m 41s
tests (3.4, 7.1)	6m 17s
tests (3.4, 7.2)	6m 34s
tests (3.2, 7.1)	5m 49s
tests (4.0, edge)	10s
tests (3.4, 8.1)	6m 19s
tests (head, 8.1)	12s
tests (4.0, 7.2)	6m 15s
tests (head, 7.1)	8s
tests (head, 8.0)	8s
tests (4.0, 7.1)	6m 20s
tests (3.4, edge)	16s
tests (3.3, 7.1, --enable-frozen-string-literal)	6m 17s
tests (head, edge)	15s
tests (4.0, 8.1)	6m 10s
tests (head, 7.2)	8s
tests (4.0, 8.0)	6m 32s
tests (3.4, 8.0)	6m 35s
summary	4s
	2h 2m 24s

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