New Makefile target to run a solo test

[billschereriii]

Description

To run a single test in SmartRedis currently requires execution of several manual steps. A new Makefile target could automate these.

Justification

It's a small simplification that means that developers won't need to remember manual steps.

Implementation Strategy

Create a new Make target, test-solo that accepts an argument for the target test as well as all the standard args. Duplicate or tweak the automation framework to run just this test.