Merge changes I3bfc9e37,Ib3907fbe,Ib673838d,I423def04,Ifde6c5f3, ... into ub-contactsdialer-i-dev

* changes:
  Fix test flakiness caused by not cleaning up test accounts
  Fix issue with account existence check
  Add convenience methods for account loading
  Use AccountsLoader in settings fragment
  Replace several usages for of AccountTypeManager.getAccounts
  Split AccountTypeManager.contains method