spec: once-ler spec/controllers/[f-l]*

reduce runtime ~65% (5:05 -> 1:50)

Change-Id: I5090e1d66bc4dc3315734090d160046df16df1dc
Reviewed-on: https://gerrit.instructure.com/38667
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Landon Wilkins <lwilkins@instructure.com>
Product-Review: Jon Jensen <jon@instructure.com>
QA-Review: Jon Jensen <jon@instructure.com>