Minor - make AuthMe.database private

- In favor of AuthMe.getDataSource()

src/main/java/fr/xephi/authme/command/executable/authme/ChangePasswordAdminCommand.java

@@ -7,7 +7,6 @@ import fr.xephi.authme.command.CommandService;
 import fr.xephi.authme.command.ExecutableCommand;
 import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.output.MessageKey;
-import fr.xephi.authme.security.PasswordSecurity;
 import fr.xephi.authme.security.crypts.HashResult;
 import fr.xephi.authme.settings.Settings;
 import org.bukkit.command.CommandSender;
@@ -72,10 +71,8 @@ public class ChangePasswordAdminCommand implements ExecutableCommand {
                 HashResult hashResult = commandService.getPasswordSecurity().computeHash(playerPass, playerNameLowerCase);
                 auth.setHash(hashResult.getHash());
                 auth.setSalt(hashResult.getSalt());
-                if (PasswordSecurity.userSalt.containsKey(playerNameLowerCase)) {
-                    auth.setSalt(PasswordSecurity.userSalt.get(playerNameLowerCase));
-                    commandService.getDataSource().updateSalt(auth);
-                }
+
+                // TODO #358: updatePassword(auth) needs to update the salt, too.
                 if (!dataSource.updatePassword(auth)) {
                     commandService.send(sender, MessageKey.ERROR);
                 } else {

src/main/java/fr/xephi/authme/command/executable/authme/PurgeBannedPlayersCommand.java

@@ -24,7 +24,7 @@ public class PurgeBannedPlayersCommand implements ExecutableCommand {
         }
 
         // Purge the banned players
-        plugin.database.purgeBanned(bannedPlayers);
+        plugin.getDataSource().purgeBanned(bannedPlayers);
         if (Settings.purgeEssentialsFile && plugin.ess != null)
             plugin.dataManager.purgeEssentials(bannedPlayers);
         if (Settings.purgePlayerDat)