setup staging pages application and sites domains

[amirbey]

Background (Optional)

Register wildcard domains needed for staging pages app and sites

Acceptance Criteria

Setup and ssl cert for following domains:

• [x] *.sites.pages-staging.cloud.gov
• [x] *.pages-staging.cloud.gov

Level of effort - medium

Implementation outline (if higher than "low" effort):

• [x] https://github.com/cloud-gov/cg-provision/pull/855

[davemcorwin]

woohoo, special thanks to @bengerman13 for helping to get the staging urls up!!!!

[davemcorwin]

@amirbey Updated this to reflect staging only and created a new issue to track production: https://github.com/18F/federalist/issues/3516.