Track and prioritize routing according to application restart generations #275

Job	Run time
C++ tests on Linux	48s
Apache2 tests on Linux	2m 49s
Apache2 tests on macOS	3m 5s
C++ tests on macOS	52s
Homebrew packaging tests	4m 22s
Nginx tests on Linux	3m 1s
Nginx dynamic module tests on Linux	1m 32s
Nginx tests on macOS	3m 14s
Node.js tests on Linux	29s
Nginx dynamic module tests on macOS	2m 2s
Node.js tests on macOS	27s
Ruby tests on Linux	1m 30s
Source packaging tests	30s
Ruby tests on macOS	1m 18s
Passenger Standalone tests on Linux	3m 46s
Passenger Standalone tests on macOS	1m 42s
	31m 27s

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