Host test copy functionality migration: added required parameters for host_test.py command line: path to image, copy method
Host test copy functionality migration: removed all extra port and disk functionality. It will be added when it is really needed
Host test copy functionality migration: removed all extra port and disk functionality. It will be added when it is really needed
Host test copy functionality migration: copy functionality partially moved to host_test (tested with basic set of tests, not with e.g. NET tests.

Host test copy functionality: TODO: modify rest of host tests to use self.mbed.reset() and self.mbed.copy_image() according to curent test scipt API
Host test plugins: Added extra line for error printing in mbed copy plugin. For readability reasons
Host test plugins: Default host test aligned and refactored so it can be invoked via run() function
Host test plugins: run() function will just print result from test() function directly, not check boolean state from test
Host test plugins: refactored TestResults class to HostTestResults name
Host test plugins: removed unused self.mbed.reset() call in test constructor. No need for two resets because reset is performed in run() function