port some flavor tests into nova v3 part1

This changeset only copies the v2 files into the appropriate v3
directories unchanged. This is being tried in order to make
reviewing of the porting easier as gerrit will display only what
is actually changed for v3 rather than entirely new files.

Partially implements blueprint nova-v3-api-tests

Change-Id: I24b9f5e5159b9c559cdc3677cdb18d5d189dda84
Check HTTP response headers of Swift middleware API in detail

All HTTP response headers of APIs for each Swift middleware are checked
their existence and format as those of Swift 'standard' API are.

Change-Id: I45005861873af66a126a3ebe0b04dd84c9a26eda
Closes-Bug: #1240856
Merge "Check HTTP response headers of Swift middleware API in detail"
Merge "port some flavor tests into nova v3 part1"