use Process.setproctitle to avoid bundler bug #305

Job	Run time
Apache2 tests on Linux	2m 6s
Apache2 tests on macOS	2m 0s
C++ tests on Linux	1m 22s
C++ tests on macOS	4m 15s
Homebrew packaging tests	6m 47s
Nginx tests on Linux	2m 20s
Nginx tests on macOS	4m 0s
Nginx dynamic module tests on Linux	1m 4s
Nginx dynamic module tests on macOS	1m 8s
Node.js tests on Linux	24s
Ruby tests on Linux	1m 6s
Node.js tests on macOS	22s
Ruby tests on macOS	1m 3s
Source packaging tests	24s
Passenger Standalone tests on Linux	3m 35s
Passenger Standalone tests on macOS	4m 29s
	36m 25s

Provide feedback