Do not use o=ALL_EMAILS parameter.

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
diff --git a/tools/checkowners.py b/tools/checkowners.py
index 1190d30..54198a7 100755
--- a/tools/checkowners.py
+++ b/tools/checkowners.py
@@ -30,12 +30,11 @@
 
 def find_address(address):
   if address not in checked_addresses:
-    request = (gerrit_server + '/accounts/?n=1&o=ALL_EMAILS&q=email:'
+    request = (gerrit_server + '/accounts/?n=1&q=email:'
                + urllib.quote(address))
     echo('Checking email address: ' + address)
     result = urllib2.urlopen(request).read()
-    checked_addresses[address] = (
-        result.find('"email":') >= 0 and result.find('"_account_id":') >= 0)
+    checked_addresses[address] = result.find('"_account_id":') >= 0
   return checked_addresses[address]