[20181019173240] App Lock, S3 Resource Encryption, and Bug Fixes

[ddollar]

Adds two new commands convox apps lock and convox apps unlock to enable/disable termination protection.

S3 resources are now encrypted at rest by default.

• #2980 fix typo in redis resource options help docs [@btucker]
• #2985 encrypt s3 resources by default [@ddollar]
• #2986 lock and unlock apps for termination protection [@ddollar]
• #2987 skip password on resource updates [@ddollar]