add stop timeout option (#2578) #306

Job	Run time
C++ tests on Linux	1m 23s
C++ tests on macOS	3m 45s
Nginx tests on Linux	2m 16s
Nginx tests on macOS	2m 41s
Apache2 tests on Linux	2m 10s
Homebrew packaging tests	6m 56s
Apache2 tests on macOS	2m 19s
Nginx dynamic module tests on Linux	1m 8s
Nginx dynamic module tests on macOS	1m 7s
Node.js tests on Linux	16s
Ruby tests on Linux	1m 8s
Ruby tests on macOS	1m 20s
Passenger Standalone tests on Linux	4m 2s
Node.js tests on macOS	23s
Passenger Standalone tests on macOS	4m 11s
Source packaging tests	24s
	35m 29s

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