port flavors and server_password 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: Ifd7409aa7ece0f3a882918cfde66f5e45cea6576
Merge "port flavors and server_password tests into nova v3 part1"