added missing course settings to xsd file
added missing course settings to xsd file

Adds a few newer course settings to the xsd file.

Fixes CNVS-19750

Test plan:

* Go to <your canvas instance>/xsd/cccv1p0.xsd
* Verify that the following elements are shown under the course element (should be the first section):
   * lock_all_announcements
   * public_syllabus
   * hide_distribution_graphs
   * allow_student_discussion_topics
   * allow_student_discussion_editing

Change-Id: I09170c9cd421a9516c059958a347a2c4d4e97986
Reviewed-on: https://gerrit.instructure.com/51937
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Product-Review: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Jahnavi Yetukuri <ed2b2672ccc2e59e56c0615df7f01b579202e014@instructure.com>

juoni/canvas-lms,jay3126/canvas-lms,greyhwndz/canvas-lms,wrdsb/canvas-lms,dgynn/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,kyroskoh/canvas-lms,whalejasmine/canvas-lms,wrdsb/canvas-lms,efrj/canvas-lms,snehakachroo1/LSI_replica,HotChalk/canvas-lms,matematikk-mooc/canvas-lms,matematikk-mooc/canvas-lms,utkarshx/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,snehakachroo1/LSI_replica,antoniuslin/canvas-lms,va7map/canvas-lms,dgynn/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,greyhwndz/canvas-lms,roxolan/canvas-lms,snehakachroo1/LSI_replica,eCNAP/CANVAS,Rvor/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,narigone/canvas,skmezanul/canvas-lms,instructure/canvas-lms,greyhwndz/canvas-lms,skmezanul/canvas-lms,ShreniiNepal/shrenii_lmp,Rvor/canvas-lms,tgroshon/canvas-lms,Jyaasa/canvas-lms,efrj/canvas-lms,grahamb/canvas-lms,AndranikMarkosyan/lms,Rvor/canvas-lms,antoniuslin/canvas-lms,juoni/canvas-lms,djbender/canvas-lms,fronteerio/canvas-lms,skmezanul/canvas-lms,Rvor/canvas-lms,sfu/canvas-lms,kyroskoh/canvas-lms,fronteerio/canvas-lms,sdeleon28/canvas-lms,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,antoniuslin/canvas-lms,fronteerio/canvas-lms,leftplusrightllc/canvas-lms,wrdsb/canvas-lms,greyhwndz/canvas-lms,fronteerio/canvas-lms,wrdsb/canvas-lms,roxolan/canvas-lms,Jyaasa/canvas-lms,HotChalk/canvas-lms,SwinburneOnline/canvas-lms,kyroskoh/canvas-lms,leftplusrightllc/canvas-lms,whalejasmine/canvas-lms,sfu/canvas-lms,jay3126/canvas-lms,leftplusrightllc/canvas-lms,instructure/canvas-lms,shidao-fm/canvas-lms,sdeleon28/canvas-lms,tgroshon/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,utkarshx/canvas-lms,SwinburneOnline/canvas-lms,ShreniiNepal/shrenii_lmp,narigone/canvas,matematikk-mooc/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,AndranikMarkosyan/lms,eCNAP/CANVAS,va7map/canvas-lms,redconfetti/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,eCNAP/CANVAS,djbender/canvas-lms,juoni/canvas-lms,tgroshon/canvas-lms,efrj/canvas-lms,shidao-fm/canvas-lms,va7map/canvas-lms,redconfetti/canvas-lms,roxolan/canvas-lms,utkarshx/canvas-lms,ShreniiNepal/shrenii_lmp,shidao-fm/canvas-lms,jay3126/canvas-lms,venturehive/canvas-lms,leftplusrightllc/canvas-lms,shidao-fm/canvas-lms,dgynn/canvas-lms,Jyaasa/canvas-lms,grahamb/canvas-lms,jay3126/canvas-lms,roxolan/canvas-lms,Jyaasa/canvas-lms,kyroskoh/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,AndranikMarkosyan/lms,AndranikMarkosyan/lms,venturehive/canvas-lms,ShreniiNepal/shrenii_lmp,whalejasmine/canvas-lms,HotChalk/canvas-lms,sdeleon28/canvas-lms,antoniuslin/canvas-lms,sfu/canvas-lms,narigone/canvas,eCNAP/CANVAS,dgynn/canvas-lms,venturehive/canvas-lms,skmezanul/canvas-lms,juoni/canvas-lms,instructure/canvas-lms,utkarshx/canvas-lms,snehakachroo1/LSI_replica,grahamb/canvas-lms,va7map/canvas-lms,whalejasmine/canvas-lms,tgroshon/canvas-lms,narigone/canvas,sdeleon28/canvas-lms,efrj/canvas-lms