make engine ignore facilities (for testing of new engine)

{alcor,aldor,ascor,torque}.ics.muni.cz
Lower number of gen workers in Engine

- Due to new functionality with preferred unix GID, gen services using
	this new attribute takes more time to get data therefore generating
	process ends on apache timeout.
- This patch lowers number of gen workers. Hopefully this decrease stress
	on core and even passwd gen services returns data before apache
	timeout.