Revert DB change for OAuth. Change compound key for oauth_application_user

back to (profile_id, application_id). I think we can get away without
a DB change by only issuing one anonymous access token per user.

classes/Oauth_application_user.php

@@ -13,7 +13,7 @@ class Oauth_application_user extends Memcached_DataObject
     public $profile_id;                      // int(4)  primary_key not_null
     public $application_id;                  // int(4)  primary_key not_null
     public $access_type;                     // tinyint(1)
-    public $token;                           // varchar(255) primary_key not_null
+    public $token;                           // varchar(255)
     public $created;                         // datetime   not_null
     public $modified;                        // timestamp   not_null default_CURRENT_TIMESTAMP
 

classes/statusnet.ini

@@ -393,14 +393,13 @@ name = U
 profile_id = 129
 application_id = 129
 access_type = 17
-token = 130
+token = 2
 created = 142
 modified = 384
 
 [oauth_application_user__keys]
 profile_id = K
 application_id = K
-token = K
 
 [profile]
 id = 129

db/statusnet.sql

@@ -231,10 +231,10 @@ create table oauth_application_user (
     profile_id integer not null comment 'user of the application' references profile (id),
     application_id integer not null comment 'id of the application' references oauth_application (id),
     access_type tinyint default 0 comment 'access type, bit 1 = read, bit 2 = write',
-    token varchar(255) not null comment 'request or access token',
+    token varchar(255) comment 'request or access token',
     created datetime not null comment 'date this record was created',
     modified timestamp comment 'date this record was modified',
-    constraint primary key (profile_id, application_id, token)
+    constraint primary key (profile_id, application_id)
 ) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
 
 /* These are used by JanRain OpenID library */