Update owners for keystore related files

- Make core/java/android/security/keystore/OWNERS include
  keystore/OWNERS instead of duplicating it

- Make core/tests/coretests/src/android/security/keystore/ owned by
  keystore/OWNERS instead of no one

- Make core/java/android/security/Confirmation*.java owned by
  keystore/OWNERS instead of an individual person

- Remove core/java/android/security/keystore/recovery/OWNERS, as it was
  redundant with OWNERS of its parent directory

- Remove Xoogler jdanis@

Change-Id: I64c1c624dcc92fbf20a6d4fb667cf47240edf4d5