Ensure NVP API connection port is always an integer

Convert the 'port' part of a NVP endpoint to int before passing
it to the NVP API client.

Change-Id: I15137d943ab950cb5cc80d7af2971bce3ac1a265
Closes-Bug: #1255519
Add vpnaas and debug filters to setup.cfg

Change-Id: I44f7e4a44276a386b6e4d8bfb8370eb103787a21
Closes-Bug: 1257523
(cherry picked from commit af6c2bbfe6b5694090f4f33d75663024d1b6e066)
Merge "Add vpnaas and debug filters to setup.cfg" into stable/havana
Merge "Ensure NVP API connection port is always an integer" into stable/havana