Fix the ContactsTest account type and sync adapter (1/2)

* Add TestSyncService$Basic to the AndroidManifest and give
  it the fallback account type unit test contacts.xml.

* Remove "common" from the testauth package name

* Change the test accountType to end with testauth.basic
  instead of authtest.basic since it's testauth
  everywhere else.

* UI changes
- Give the test account type the same name as the app
- Remove the ic_contact_picture test account type icon
  since it just looks like a black square and we can
  just use the default (after we add a guard against
  null icons in the DrawerActivity)

Test: manually add a user of the test account type and
  toggle sync, then add a contact of the test account
  type in the app.

Bug: 30759296
Bug: 31549157

Change-Id: I363fff8dfbce3d2d1b888e23abe6e20a40da2d1c