GET /accounts/{id}/groups

Obtain the list of groups a target user is a member of from
within the user resource, rather than /groups/?user={id} query.
This is a different projection of essentially the same data,
but I think it makes sense to allow a user to ask for their
groups within their account.

A nice benefit is we can now ask /accounts/self/groups to see
our own groups at any time, whereas /groups/?user={id} does not
accept self as an argument.

Unlike /groups/?user={id} query any user can see a subset of
another user's groups if two things are true:

  - The caller can see the other user.
    Often true when both users have a group in common.

  - The caller can see the group.
    True when the caller is an owner of that group, or
    the group is visible to everyone.

  - The caller can see the members of the group.
    True if the caller is an owner, or the group
    is visible to everyone.

Change-Id: I43d43f2f774dafb1f77fd047b50b6fa050f82d07

gerrit-server/src/main/java/com/google/gerrit/server/group/ListIncludedGroups.java

@@ -24,7 +24,6 @@ import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gerrit.reviewdb.client.AccountGroupIncludeByUuid;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.account.GroupControl;
-import com.google.gerrit.server.group.GetGroup.GroupInfo;
 import com.google.gwtorm.server.OrmException;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
@@ -63,7 +62,7 @@ public class ListIncludedGroups implements RestReadView<GroupResource> {
       try {
         GroupControl i = controlFactory.controlFor(u.getIncludeUUID());
         if (ownerOfParent || i.isVisible()) {
-          included.add(new GetGroup.GroupInfo(i.getGroup()));
+          included.add(new GroupInfo(i.getGroup()));
         }
       } catch (NoSuchGroupException notFound) {
         log.warn(String.format("Group %s no longer available, included into ",