Backporting remote sql server configuration bugfix from 3.1~alpha1

debian/alternc.config

@@ -309,16 +309,28 @@ db_set alternc/mysql/db "$MYSQL_DATABASE"
 fi
 
 db_get alternc/mysql/user
-if [ -z "$RET" ]
+if [ -z "$RET" ] 
     then
-db_set alternc/mysql/user "$MYSQL_USER"
-fi
-
+  db_get alternc/mysql/remote_user
+  if [ -z "$RET" ]
+  then  
+    db_set alternc/mysql/user "$MYSQL_USER"
+  else  
+    db_set alternc/mysql/user "$RET"
+  fi    
+fi      
+        
 db_get alternc/mysql/password
 if [ -z "$RET" ]
-    then
-db_set alternc/mysql/password "$MYSQL_PASS"
-fi
+    then  
+  db_get alternc/mysql/remote_password
+  if [ -z "$RET" ] 
+    then    
+    db_set alternc/mysql/password "$MYSQL_PASS"
+  else
+    db_set alternc/mysql/password "$RET"
+  fi 
+fi  
 
 db_get alternc/mysql/client
 if [ -z "$RET" ]