Set up the Metad client with allow_non_master
Set up the Metad client with allow_non_master

.. since the communication takes place on non-master nodes.

This ensures the client properly retries if there is a communication
failure.

Signed-off-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>
Reviewed-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>

andir/ganeti,leshchevds/ganeti,ganeti/ganeti,leshchevds/ganeti,andir/ganeti,bitemyapp/ganeti,bitemyapp/ganeti,yiannist/ganeti,mbakke/ganeti,yiannist/ganeti,yiannist/ganeti,onponomarev/ganeti,andir/ganeti,grnet/snf-ganeti,ganeti/ganeti,leshchevds/ganeti,mbakke/ganeti,mbakke/ganeti,grnet/snf-ganeti,onponomarev/ganeti,ganeti/ganeti