Enable verbose execute, added nvflash and fastboot path functions
Don't init nvflash before repartitioning.
Changes in nvflash module
- fix repart function
- use nvflash() and fastboot() instead of externals() and hardcoding
nvflash module: use --sync instead of --go
Changes in update module:
- use return instead of exit
- return 0 if generation was succeeded
- import generated function from common module
Changes in ac100 module
- import missed function from update and nvflash modules