Enrollment#sis_user_id convenience method
Enrollment#sis_user_id convenience method

Change-Id: Ib37e4ce1d494b5489490c9d582793447188ebf16
Reviewed-on: https://gerrit.instructure.com/17528
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Clare Hetherington <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>

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