write espresso tests for configuration wizard setup flow
includes general setup flow for
- ProviderListActivity -> loading screen -> ProviderDetailActivity -> ProviderCredentialsActivity (signup)
- ProviderListActivity -> loading screen -> ProviderDetailActivity -> ProviderCredentialsActivity (login)
- ProviderListActivity -> loading screen -> ProviderDetailActivity -> VpnFragment (anonymous login)
for now using demo.bitmask.net as real Backend