Use correct exception in L3 driver controller

The driver controller was using Invalid instead of InvalidInput
for validation errors. This was being converted to a 500 instead
of a BadRequest. This patch corrects it to use InvalidInput.

Change-Id: I8f4913fe8f98580a925d3f5b80ad0353e4c9636f
Partial-Bug: #1621430
1 file changed
tree: 0b5d906e154192eca04b50716736b0de4cee8193
  1. neutron/