Fix server name for labs parsoid (deployment-parsoid3)

Change-Id: I60849db891db55315056a8a9e8d6757c2c1438fc
Enable VisualEditor as default to "phase 3" Wikipedias

For merger on 2 December.

Bug: 49999
Change-Id: Ifa43f7828f4f7eda9c59ce889bafe74b66542615
Merge "Fix server name for labs parsoid (deployment-parsoid3)"
Merge "Enable VisualEditor as default to "phase 3" Wikipedias"