Merge branch 'stable-6.0' into feature/app_generations #268

Job	Run time
Apache2 tests on Linux	2m 10s
Apache2 tests on macOS	2m 55s
C++ tests on Linux	1m 40s
C++ tests on macOS	4m 32s
Homebrew packaging tests	6m 59s
Node.js tests on Linux	25s
Nginx dynamic module tests on Linux	1m 10s
Nginx tests on Linux	2m 22s
Nginx dynamic module tests on macOS	1m 31s
Nginx tests on macOS	2m 57s
Ruby tests on Linux	1m 8s
Node.js tests on macOS	31s
Ruby tests on macOS	1m 11s
Source packaging tests	31s
Passenger Standalone tests on Linux	4m 20s
Passenger Standalone tests on macOS	4m 40s
	39m 2s

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