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> connection = mysql://keystone:keystone@192.168.122.10/keystone
>
> mysql> select User,Host from mysql.user;
> | keystone         | localhost         |
>
> sqlalchemy.exc.OperationalError: (OperationalError) 
> (1045, "Access denied for user 'keystone'@'ubu-a.arindam.com' (using password: YES)") None None

Looks like a pretty clear error message to me.

Note that if you specify 192.168.122.10 as a database host you need to give grants to that user from the IP it will connect from. If it is on the same machine it will probably connect from 192.168.122.10
If you set mysql user permissions from localhost you will also need to connect to localhost in the keystone.conf.

Cheers,
Robert van Leeuwen