Require newer right_aws gem in Gemfile

[#44502395]
Update staging user data for new VPC instances

[#44502395]
Updated cap configs to work with AWS VPC

[#44502395]
Update cap-tasks
Merge branch 'aws-vpc' into stable
Handle negative deltas to memcache.incr/decr

Newer memcaches do not accept negative arguments to these commands.
Previously a patched version of memcache was used. This should remove
the need for that patch.

[#44614263]