As legacy v2 code is removed and v2.1(v2 compatible mode) validate
API request body through json schema, python code validation
for some request param is not needed now.
- UUID checks for sch_hint: 'group' - Done by JSON schema
- create network param checking - moved to nova-manage(for API,
JSON schema does validation)
Adding more UT and also removing legacy_v2 files from py34 blacklist tests file.
Partially implements blueprint remove-legacy-v2-api-code
Change-Id: I2e247051c982e894b81c1ef83aa12dc9d56d94da