gw_port should be set as lazy='join'

This forces the object to be ready ahead of accessing time.
The change in loading behavior is also beneficial while listing
routers, as reduces the amount of queries being issued. Tests
show a performance gain of 15-30% for router-list times.

As Mr. Aaron Rosen is used to saying: Woot woot!!

Closes-bug: #1309144

Change-Id: Ibae261b91de26ca7c50e3f6c80e9be2a799785a3
(cherry picked from commit 966dbb5368d710e2652b18f5b9cb4295f58598da)
NSX: Fix fake_api_client to raise NotFound

If one quries NSX doing GET /ws.v1/lswitch/LS_UUID/lport and LS_UUID
is a UUID that does not exist in NSX. NSX raises a 404. If LS_UUID is *
NSX returns an empty result string. This patch fixes the fake_api_client
so that it's behavior is correct.

Change-Id: Id66299d6ae3cfa43a65d4cb28f34348d64d8ed65
Closes-bug: 1311291
(cherry picked from commit dd143a619900792a0563b9ac4fe1f78197291d94)
Merge "gw_port should be set as lazy='join'" into stable/icehouse
Merge "NSX: Fix fake_api_client to raise NotFound" into stable/icehouse