[grader] remove DRY for import_problem
[grader] remove DRY for import_problem

git-svn-id: 0e7d180c1756de014b8f4d2a2c0b05a59909ba3f@177 6386c4cd-e34a-4fa8-8920-d93eb39b512e

nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts,nattee/cafe-grader-judge-scripts,jittat/cafe-grader-judge-scripts