[20180826001030] Env Edit and Bug Fixes

[ddollar]

Adds a new CLI command convox env edit to interactively the environment of an application.

Changes the app-level redis resource to only use transit-level authentication when the encryption option is specified.

• #2867 api tests [@ddollar]
• #2875 set redis password and protocol when encrypted [@slaskis]
• #2876 add convox env edit command [@ddollar]