Refactoring some code, merge st-probe and fixup #318 serial print#398

Merged

texane merged 3 commits intostlink-org:masterfrom xor-gate:refactoring

Apr 16, 2016

+159-129

Commits on Apr 15, 2016

Fix hang when user has no libusb access because of plugdev under e.g linux.
Jerry Jacobs
committed
* Merge st-probe tool into st-info
Jerry Jacobs
committed
stlink_open_usb: Fix issue where serial is not cached when serial is not compared in search
Jerry Jacobs
committed