The --dry-run option is not yet implemented but with
this commit it has been added to the list of parsed options.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Convert required options to positional arguments.
Required options are not a good idea because it can be
confusing for the user have an option (that should be
optional) required for running the script.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Implment backup_oniro, now the script can backup the project so
that in case something goes wrong in the upgrade we can restore
the initial state (this function is not yer implement).
Add TODOs.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Move upgrade_oniro.py in upgrade_oniro directory.
Create utils python lib, this will collect utils functions
used in the main scirpt.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Add global script options.
Change function name arg_parsing -> init_script_options to reflect
better the behevior of the function.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>