Allow opting out of new routing algorithm via a flag (#2590) #326

Job	Run time
Apache2 tests on Linux	2m 22s
Apache2 tests on macOS	2m 21s
C++ tests on Linux	1m 23s
C++ tests on macOS	4m 6s
Homebrew packaging tests	7m 50s
Nginx tests on Linux	3m 32s
Nginx tests on macOS	3m 1s
Nginx dynamic module tests on Linux	1m 16s
Nginx dynamic module tests on macOS	1m 5s
Node.js tests on Linux	15s
Source packaging tests	32s
Ruby tests on Linux	1m 47s
Node.js tests on macOS	23s
Ruby tests on macOS	1m 14s
Passenger Standalone tests on Linux	3m 10s
Passenger Standalone tests on macOS	4m 33s
	38m 50s

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