Prepare for enabling H302 rule (api/volume,tempest/*)

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*}
    tempest/api/compute/{v3,volumes},data_processing
    tempest/api/identity/admin
    tempest/api/image
    tempest/api/{n*,o*,t*}
    tempest/api/volume,tempest/*     <- This patch
    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: I65e9ac5678d17f31de5449017f2193f53c74c535
Merge "Prepare for enabling H302 rule (api/volume,tempest/*)"