Allow * origins for LTI iframe allowances
Allow * origins for LTI iframe allowances

Closes PLAT-3130

Test Plan:
- Verify all LTI launch iframes now have the following
  value for the allow attribute: 'geolocation *; microphone *;
  camera *; midi *; encrypted-media *'

Change-Id: I4d05d59a6ad9686ba8750b7b181bafb2b1bd3f5d
Reviewed-on: https://gerrit.instructure.com/140910
Tested-by: Jenkins
Reviewed-by: Stewie aka Nicholas Stewart <bec99285d8f1953757afca2af84365b0776c1eb4@instructure.com>
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Product-Review: Weston Dransfield <e9203059795dc94e28a8831c65eb7869e818825e@instructure.com>

djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,instructure/canvas-lms