If the user wants to register a new account we check whether the
provider allows registration or not right after getting the
provider.json file and show an error msg on the wizard if not allowed.

Also, there is a new signal to handle the error raised by the server if
a registration attempt is made but is rejected with error 403.

- Resolves: #6594

Is valid for a provider not to provide locations for their gateways.

- Resolves: #7281

Register to Soledad's sync (send and receive) events and display the
progress in the UI.

- Resolves: #7353

apply_updates.py applies the already downloaded files from the updates
folder and removes all the obsolete files from the bundle. It's meant
to be use by the pyinstaller bundle.

- Resolves: #7342
- Related: #5876

The tests where using deferToThread to run without need, I remove it
and now it's easier to debug when one test fails.

- Resolves: #7343

The new pyinstaller method will rule out the launcher, we need the
updater working inside bitmask client.

- Closes: #7291

Fix:
If the logbook controller is not started the stop call will fail.
Trying to start it twice fails.