Enable H302 check (api/compute/{c*,f*,i*,s*,t*})

We can use H302 rule but ignore it now. This commit prepares for
enabling H302 rule. But this commit modifies a part of Tempest only
because if we fix all of them at one time, it's hard to merge this
commit.
    ---------------
    tempest/api/compute/admin
    tempest/api/compute/{c*,f*,i*,s*,t*}     <- This patch
    tempest/api/compute/{v3,volumes},data_processing
    tempest/api/identity/admin
    tempest/api/image
    tempest/api/{n*,o*,t*}
    tempest/api/volume,tempest/*
    tempest/services/compute/json
    tempest/services/compute/v3/json
    tempest/services/compute/xml
    tempest/services/identity
    tempest/services/{im*,n*,o*,t*}
    tempest/services/volume
    tempest/clients.py: TBD
    ---------------

Change-Id: I9d4041754df0e9f20937300b1e19c8ae63d4090a
Adds basic Marconi test

This patch adds the config options needed to add Queuing tests.
This patch also has a basic test to verify that everything works
as expected.

Change-Id: I0769affe66a1e94bff366305e230c1b388e68278
Implements: blueprint add-basic-marconi-tests
Verify service attributes through Nova "get services" API

This patch adds checks whether a response of Nova "get services" API
includes the attributes to block the backward incompatibility change
in the future.

This patch implements the base part of a response validation.
The design is the following:
 * Each API schema is defined under tempest/api/compute/api_schema/
 * If API schemas of v2 and v3 are the same, define common API schema
   under tempest/api/compute/api_schema/
 * Otherwise, API schemas of v2 should be defined under v2/ and the
   one of v3 should be under v3/
 * Each API schema defines the succeeded status code('status_code')
   and response body('response_body')

Partially implements blueprint nova-api-attribute-test

Change-Id: Id0b4c31d47f7c6abafcb3c2ded9309fac61cb3dc
Merge "Adds basic Marconi test"
Merge "Enable H302 check (api/compute/{c*,f*,i*,s*,t*})"
Merge "Verify service attributes through Nova "get services" API"
Merge branch 'master' of https://github.com/openstack/tempest