Add ability to override testify properties from the command line

[oconnormi]

When running tests against alternate configurations, properties files need to be updated accordingly so that a test can be run. Having a method that allowed for properties overrides from the command line would make testing alternative systems easier

[oconnormi]

As part of designing the new cli a properties option has been added that should allow easy property input. The first approach will be to simply have the cli properties added in after the properties read from files. This will effectively allow them to "overrride" file based properties