ec2 api should check 'max_count'&'min_count' para

in ec2 api,run_instance method have not check para
about 'max_count' and 'min_count'

Change-Id: I852dac71e56c658a54b127053cba155e1a260a73
Closes-Bug: #1267382
Add API schema for v3 rescue API

By defining the API schema, it is possible to separate the validation
code from the API method. The API method can be more simple.
In addition, a response of API validation error can be consistent for
the whole Nova API.

Partially implements blueprint nova-api-validation-fw

Change-Id: I3d08bc20e4c585dca1e218e8d97b208d158a3096
Fixed incorrect test case of test_server_metadata.py

Fixed incorrect test case about following points.
 * delete 2 test case because same test will be done
   in other part of same class.
 * fixed parameter according to test purpose.
 * fixed expected exception code.

Change-Id: I3116e9b4e22a86c583a531c8b8e46069f876296e
Corrected typo in metrics

Change-Id: If23292d83776be50f22f45c849fd45b7b04da7d9
Merge "ec2 api should check 'max_count'&'min_count' para"
Merge "Fixed incorrect test case of test_server_metadata.py"
Merge "Corrected typo in metrics"
Merge "Add API schema for v3 rescue API"