sde test fails to build model when a spec file is provided

[chrispcampbell]

Some of the sde CLI files, such as sde-build.js, have an async handler function, which works fine when that command is called directly (e.g. sde build --spec spec.json) but other commands are implemented by chaining and can fail when a spec file is passed on the command line. The spec file is read in an async function, but some of the chaining cases do not use async/await.

For example:

• sde test calls run (which is currently not marked async)
• run then calls build (also not marked async)
• build calls generate (which is marked async)

Long story short, we need to add async and await in a couple more places to ensure that the spec file is read fully before proceeding with each step.

[chrispcampbell]

Fixed on develop in afdbb77.