Support generation of a test skeleton

[teojgo]

It would be nice if ReFrame could generate the basic skeleton of a test from the command line, e.g:

reframe --generate 'MyTest'

would generate the python file with the bare minimum boilerplate for a test and the users can edit it according to their needs

[victorusu]

We should do this! This is a great idea. But I would vote to use a different syntax, something on the lines of

reframe create <MyClassName>

that we could something like

reframe create from RunOnlyRegressionTest <MyClassName> 

or from a library test

reframe create from GpuBurnCheck <MyClassName>