Fix setUp and tearDown methods in skill_map LessonHeaderTests.
Fix setUp and tearDown methods in skill_map LessonHeaderTests.

	Change on 2016/09/02 by tujohnson <tujohnson@google.com>

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132107146

andela-angene/coursebuilder-core,andela-angene/coursebuilder-core,andela-angene/coursebuilder-core,andela-angene/coursebuilder-core