Move sendemail.allowRegisterNewEmail to auth.allowRegisterNewEmail

The sendemail section of the configuration is for settings related to how
Gerrit sends emails to users. allowRegisterEmail controls whether or not
users are allowed to register a new email address, which is not related
to Gerrit's sending of email.

Move the setting to the auth section, which is a more appropriate place
for it.

Change-Id: I06d9c4870060eb85bc4a05b536645d42df44e041

gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapRealm.java

@@ -33,7 +33,6 @@ import com.google.gerrit.server.account.EmailExpander;
 import com.google.gerrit.server.auth.AuthenticationUnavailableException;
 import com.google.gerrit.server.config.AuthConfig;
 import com.google.gerrit.server.config.GerritServerConfig;
-import com.google.gerrit.server.mail.EmailSettings;
 import com.google.gwtorm.server.SchemaFactory;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
@@ -79,7 +78,6 @@ public class LdapRealm extends AbstractRealm {
       Helper helper,
       AuthConfig authConfig,
       EmailExpander emailExpander,
-      EmailSettings emailSettings,
       @Named(LdapModule.GROUP_CACHE) final LoadingCache<String, Set<AccountGroup.UUID>> membershipCache,
       @Named(LdapModule.USERNAME_CACHE) final LoadingCache<String, Optional<Account.Id>> usernameCache,
       @GerritServerConfig final Config config) {
@@ -98,7 +96,7 @@ public class LdapRealm extends AbstractRealm {
     if (optdef(config, "accountSshUserName", "DEFAULT") != null) {
       readOnlyAccountFields.add(Account.FieldName.USER_NAME);
     }
-    if (!emailSettings.allowRegisterNewEmail) {
+    if (!authConfig.isAllowRegisterNewEmail()) {
       readOnlyAccountFields.add(Account.FieldName.REGISTER_NEW_EMAIL);
     }