Threading refactor (5/7): Close ordering & shutdown hardening #42

Job	Run time
bulk-filter	1m 10s
lint	3m 0s
windows	2m 38s
changes	1m 8s
generation-config-check	1m 47s
enforcer	21m 47s
units (17)	1m 39s
units (11)	1m 10s
units (8)	1m 29s
units (26)	1m 14s
units (25)	1m 12s
units (21)	1m 11s
gapic-libraries-bom	21m 9s
split-units (java-bigtable, 8)	7m 25s
split-clirr (java-bigtable)	3m 24s
split-units (java-bigtable, 25)	8m 41s
split-units (java-bigtable, 26)	8m 12s
split-dependencies (java-bigtable)	5m 48s
split-units (java-bigtable, 17)	8m 52s
split-units (java-bigtable, 11)	6m 50s
split-units (java-bigtable, 21)	7m 26s
conditional-required-check	4s
	1h 57m 16s

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