vxlan driver's instance will not be generated when vxlan is not configured in "tenant_network_types"

[Takanori Miyagishi]

vxlan driver's instance will not be generated if "vxlan" is not specified in "tenant_network_types" of ml2_conf.ini

The configuration is not must be set whether the environment will use vxlan or not.
"type_drivers" need to include "vxlan" if neutron want to have possible to create network with vxlan.

Therefore, vxlan driver's instance should be generated if "vxlan" is specified in "type_drivers".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/436751

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/436751
Committed: https://git.openstack.org/cgit/openstack/networking-fujitsu/commit/?id=d2f1729f5361400457228360c0680a9e33bad327
Submitter: Jenkins
Branch: master

commit d2f1729f5361400457228360c0680a9e33bad327
Author: takanorimiyagishi <email address hidden>
Date: Wed Feb 22 13:10:20 2017 +0900

    Fix loading from config file for fossw network type

    This commit changes loading target from 'ml2.tenant_network_type' to
    'ml2.type_drivers' to handle vxlan driver.

    Change-Id: I5bdf5b173baef1b1af456dc7fa81100522f48261
    Closes-Bug: #1666399

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ocata
Review: https://review.openstack.org/453087

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/453087
Committed: https://git.openstack.org/cgit/openstack/networking-fujitsu/commit/?id=bb2036d2dd95fc7e21123a6003aec65d90061184
Submitter: Jenkins
Branch: stable/ocata

commit bb2036d2dd95fc7e21123a6003aec65d90061184
Author: takanorimiyagishi <email address hidden>
Date: Wed Feb 22 13:10:20 2017 +0900

    Fix loading from config file for fossw network type

    This commit changes loading target from 'ml2.tenant_network_type' to
    'ml2.type_drivers' to handle vxlan driver.

    Change-Id: I5bdf5b173baef1b1af456dc7fa81100522f48261
    Closes-Bug: #1666399
    (cherry picked from commit d2f1729f5361400457228360c0680a9e33bad327)