fix timing issues in assignment selenium external_tool specs
fix timing issues in assignment selenium external_tool specs

Change-Id: Ie1df1a328262524db449ed47fc38865f67de2ebb
Reviewed-on: https://gerrit.instructure.com/6962
Reviewed-by: Bryan Madsen <0a3ba1af216659500dd8f41e29f3979f42452870@instructure.com>
Tested-by: Bryan Madsen <0a3ba1af216659500dd8f41e29f3979f42452870@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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