[TC-550] TO API - fetch deliveryservices for a user should have tenancy hooked in

[limited]

The following api route does not take into consideration the tenancy of the specified user:

get( "/api/$version/users/:id/deliveryservices

it currently does the following:

1. it checks the tenancy of the specified user vs. the tenancy of the current user to ensure the current user can see the specified user <-- this is good
2. it queries the deliveryservice_tmuser table to find the delivery services associated to the tm_user and then if finally filters the results based on the current user's tenancy <-- it should not query this table if use_tenancy = 1

if use_tenancy = 0, it should work the way it does now

if use_tenancy = 1, it should not query the deliveryservice_tmuser table but instead query the deliveryservice table and filter the results against the specified user's tenant AND the current user's tenant.

Author: Jeremy Mitchell
JIRA Link: https://issues.apache.org/jira/browse/TC-550
Found Version: 2.1.0