Improve/fix concvserver (AWS and general)
Improve/fix concvserver (AWS and general)

- If the upload user account already exists, don't delete it, just set
its home and password.
- Improve test for running on an AWS EC2 instance

NeighborhoodGuard/communityview,dougkerr/surveillance,dougkerr/surveillance,NeighborhoodGuard/communityview,NeighborhoodGuard/communityview,NeighborhoodGuard/communityview,dougkerr/surveillance,dougkerr/surveillance,dougkerr/surveillance,NeighborhoodGuard/communityview