Fix the upper values of test_network_quotas

In test_network_quotas scenario test, hard-coded values are used as
upper value.
These should be the actual quota values.

Change-Id: Ief1b12e13d0a191f2db78540d249c72c0dcc7d19
Closes-Bug: #1252999
Merge "Fix the upper values of test_network_quotas"