City principals are up in arms over a new plan that gives bonus points this year to high schools based on graduates going to college — but doesn’t count those who join the military. Department of Education officials met with a group of principals last week to explain changes in Progress Reports coming out this fall. Schools that send more kids to community or baccalaureate colleges within six to 18 months will get extra credit. When a principal asked about points for grads who choose to enlist in the armed forces, he was shot down.