Fix support for Bundler restarts (#2576) #308

Job	Run time
Apache2 tests on Linux	2m 11s
Apache2 tests on macOS	2m 11s
C++ tests on Linux	1m 21s
C++ tests on macOS	3m 54s
Nginx tests on Linux	2m 10s
Nginx tests on macOS	2m 52s
Node.js tests on Linux	15s
Nginx dynamic module tests on Linux	1m 8s
Node.js tests on macOS	26s
Nginx dynamic module tests on macOS	1m 16s
Ruby tests on Linux	1m 8s
Ruby tests on macOS	1m 9s
Source packaging tests	26s
Passenger Standalone tests on Linux	4m 12s
Passenger Standalone tests on macOS	4m 6s
Homebrew packaging tests	6m 59s
	35m 44s

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