InnoDB tablespace import fails when importing table w/ different data directory

Original bug filed by Aurimas in upstream bug tracker.

Description:
It's impossible to import a tablespace if table definition has a different data directory. For example, having data exported with the following table definition:

CREATE TABLE `user` (
  `username` varchar(20) NOT NULL,
  `name` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  UNIQUE KEY `XPKadmin_user` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

won't import into a table that has this table definition:

CREATE TABLE `user` (
  `username` varchar(20) NOT NULL,
  `name` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  UNIQUE KEY `XPKadmin_user` (`username`)
) ENGINE=InnoDB DATA DIRECTORY='/alternate/location' DEFAULT CHARSET=latin1

Tablespace import will fail with the following or similar error:

mysql> alter table `user` import tablespace;
ERROR 1808 (HY000): Schema mismatch (Table flags don't match, server table has 0x6 and the meta-data file has 0x1)

MySQL error log shows this error:

2015-03-04 13:22:27 600 [Note] InnoDB: Importing tablespace for table 'test/user' that was exported from host 'Hostname'
2015-03-04 13:22:27 600 [Note] InnoDB: Discarding tablespace of table "test"."user_copy": Generic error

How to repeat:
USE test

CREATE TABLE `user` (
  `username` varchar(20) NOT NULL,
  `name` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  UNIQUE KEY `XPKadmin_user` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `user_copy` (
  `username` varchar(20) NOT NULL,
  `name` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  UNIQUE KEY `XPKadmin_user` (`username`)
) ENGINE=InnoDB DATA DIRECTORY = '/tmp/mysql' DEFAULT CHARSET=latin1;

ALTER TABLE `user_copy` DISCARD TABLESPACE;

FLUSH TABLE `user` FOR EXPORT;

\! cp <path>/test/user.cfg /tmp/mysql/test/user_copy.cfg
\! cp <path>/test/user.ibd /tmp/mysql/test/user_copy.ibd

UNLOCK TABLES;

ALTER TABLE `user_copy` IMPORT TABLESPACE;

Suggested fix:
Ignore certain table flags for the table import, such as this one preventing the import when different data directory was used.

Additional request to also provide a fix for partitioned tables (moving a partition from fast storage to slower
storage).