For security reason, this REST API parameter needs account modification
permission to get all email addresses. Now changed to ask only account
number to verify an email address.
Bug: 79863374
Test: test with existing OWNERS
Change-Id: Ic913b7ad96a69c35d1d91e5871f4c5636e73533d
Some OWNERS files use secondary email addresses, so we only
check existence of _account_id and email attributes.
Test: run against existing OWNERS files
Change-Id: I6f0804a8a90b7a23783c3fe45686d4d973876ed1