Merge pull request #88 from pulp/rbarlow-887041

887041 - Add troubleshooting section to docs.
Merge pull request #87 from pulp/rbarlow-887032

887032 - Added docs about how to get entitlement certificates.
Merge pull request #95 from pulp/prad-891423

891423 - Migration script to fix pkg groups and category repoid
Merge branch 'pulp-2.0'