[ReleasePrep][2018.08.20]RI of dev into master#6333

Merged

chenriksson merged 17 commits intomasterfrom dev

Aug 20, 2018

+4,063-1,286

Commits on Aug 8, 2018

Fix (most) accessibility issues found by recent scan (#6215 )
Scott Bommarito
authored

Commits on Aug 9, 2018

[NuGet Symbol Server] Add Symbol push validation support (#6276 )
shishirx34
authored

Commits on Aug 10, 2018

Merge revert email retry from master to dev
zivkan
authored

Commits on Aug 13, 2018

Add ViewBase field to hide opensearch.xml link (#6304 )
Scott Bommarito
authored

Commits on Aug 14, 2018

Restore auto-add co-owner feature (#6289 )
xavierdecoster
authored

Commits on Aug 15, 2018

Commits on Aug 17, 2018

Set the CacheControl property on packages blobs (#6297 )
loic-sharma
authored