wrap opening dialog with keep_trying_until in gradebook2 selenium spec
wrap opening dialog with keep_trying_until in gradebook2 selenium spec

Change-Id: I2f82d2315aabcca5afab7a5e9534828a86f6786b
Reviewed-on: https://gerrit.instructure.com/7920
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Tested-by: Jake Sorce <c8d99c2f7cd5f432c163abcd422672b9f77550bb@instructure.com>
Reviewed-by: Jake Sorce <c8d99c2f7cd5f432c163abcd422672b9f77550bb@instructure.com>

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