use Process.setproctitle to avoid bundler bug #307

Job	Run time
C++ tests on Linux	1m 22s
Apache2 tests on Linux	2m 57s
Apache2 tests on macOS	2m 12s
C++ tests on macOS	4m 1s
Homebrew packaging tests	6m 38s
Nginx tests on Linux	2m 12s
Nginx dynamic module tests on Linux	2m 25s
Nginx tests on macOS	2m 46s
Node.js tests on Linux	17s
Nginx dynamic module tests on macOS	1m 26s
Node.js tests on macOS	22s
Ruby tests on Linux	1m 5s
Source packaging tests	31s
Passenger Standalone tests on Linux	3m 36s
Ruby tests on macOS	59s
Passenger Standalone tests on macOS	3m 19s
	36m 8s

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