use Process.setproctitle to avoid bundler bug #292

Job	Run time
Apache2 tests on Linux	2m 52s
C++ tests on Linux	2m 56s
Apache2 tests on macOS	2m 13s
C++ tests on macOS	4m 25s
Homebrew packaging tests	6m 30s
Nginx tests on Linux	3m 1s
Nginx tests on macOS	2m 32s
Node.js tests on Linux	14s
Nginx dynamic module tests on Linux	2m 2s
Node.js tests on macOS	26s
Nginx dynamic module tests on macOS	1m 13s
Source packaging tests	26s
Ruby tests on Linux	1m 41s
Passenger Standalone tests on Linux	4m 31s
Ruby tests on macOS	1m 6s
Passenger Standalone tests on macOS	4m 46s
	40m 54s

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