Description of problem:

When we want to see the quota of a tenant cinder is reporting the default quota when the parameter is a non-existing uuid.  If the parameter is the tenant name cinder reports the default quotas also thus it is an non existing uuid causing confusion

Version-Release number of selected component (if applicable):
Reported for Havana and reproduced in Juno, probably icehouse is afected too

How reproducible:
always

Steps to Reproduce:

# cinder quota-show  ba0008f1edc741eb9b45722f7d43c250
+-----------+-------+
|  Property | Value |
+-----------+-------+
| gigabytes |  111  |
| snapshots |   11  |
|  volumes  |   11  |
+-----------+-------+

# cinder quota-show  tenantvlan1
+-----------+-------+
|  Property | Value |
+-----------+-------+
| gigabytes |  400  |
| snapshots |   10  |
|  volumes  |   10  |
+-----------+-------+



Actual results:
cinder reports the default quota if we provide a non existing uuid

Expected results:
report uuid not found


Additional info:
The same behaviour is observer with the command #nova quota-show, reporting it as a separate bug