Add register_module keyword

[petrieh]

Add to RemoteRunner a new keyword

def register_module(module, timeout, with_name=None, locally_importable=True)

This keyword registers module to be imported in the remote targets on need bases.

Arguments:

• module: either module or string path to the module
• timeout: import timeout in the remote target
• with_name: optionally define the name for the module. The default is the name of the module.
• locally_importable: If the module can be imported in the locally, then define this True.

This keyword is intended only for registration purposes and thus does not import the module in the remote targets.