Track and prioritize routing according to application restart generations #277

Job	Run time
Apache2 tests on Linux	2m 8s
Apache2 tests on macOS	1s
C++ tests on Linux	1m 58s
C++ tests on macOS	1s
Homebrew packaging tests	1s
Nginx tests on Linux	2m 28s
Nginx tests on macOS	1s
Nginx dynamic module tests on Linux	1m 11s
Nginx dynamic module tests on macOS	1s
Node.js tests on Linux	19s
Node.js tests on macOS	1s
Ruby tests on Linux	38s
Ruby tests on macOS	1s
Source packaging tests	25s
Passenger Standalone tests on Linux	4m 8s
Passenger Standalone tests on macOS	1s
	13m 23s

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