Add "V2 API- add-fixed-IP and remove-fixed-IP server action" tests

This patch adds "V2 API - add-fixed-IP and remove-fixed-IP" tests.

Change-Id: I7f8dcead3c42ae01354891d9fe6fd1ced0136b72
XML endpoint client use correct string for enabled

The XML endpoint client was passing enabled='True' or
enabled='False' when creating or updating an endpoint.

The Keystone XML parser expects 'true' and 'false' for the
'enabled' attribute and only converts those strings to a Boolean
value, other values are passed through as strings.

Note that the XML identity_client correctly converts the Boolean
values to lowercase strings already.

Change-Id: I2f1374430d186959aca8fb90b4f7730044ec0c65
Closes-Bug: #1282266
Add Nova V2 API test for resetNetwork/injectNetworkInfo

This Patch adds the Nova V2 tests for resetting the server network and
injecting the network info of server.

Change-Id: Iec95b62f74834a28e68955b4fa48ebf21df4e661
Add "Nova V3 API test for add-fixed-IP/remove-fixed-IP"

This patch adds Nova V3 API test for add-fixed-IP/remove-fixed-IP.

Change-Id: I8448de16d2243bd08db50562eb2714e07b62ea63
Merge "Add "Nova V3 API test for add-fixed-IP/remove-fixed-IP""
Merge "Add "V2 API- add-fixed-IP and remove-fixed-IP server action" tests"
Merge "Add Nova V2 API test for resetNetwork/injectNetworkInfo"
Merge "XML endpoint client use correct string for enabled"
Merge branch 'master' of https://github.com/openstack/tempest