Adds flavor API tests

This patch adds flavor API tests to the Octavia tempest plugin.

Depends-On: https://review.openstack.org/626819
Change-Id: I863ca500d255fe41eef2d7434e540d53b9ead903
diff --git a/octavia_tempest_plugin/common/constants.py b/octavia_tempest_plugin/common/constants.py
index 0dd0156..0122424 100644
--- a/octavia_tempest_plugin/common/constants.py
+++ b/octavia_tempest_plugin/common/constants.py
@@ -79,6 +79,8 @@
 EXPECTED_CODES = 'expected_codes'
 
 FLAVOR_DATA = 'flavor_data'
+ENABLED = 'enabled'
+FLAVOR_PROFILE_ID = 'flavor_profile_id'
 
 # Other constants
 ACTIVE = 'ACTIVE'
@@ -242,3 +244,5 @@
 ]
 
 SHOW_FLAVOR_PROFILE_FIELDS = [ID, NAME, PROVIDER_NAME, FLAVOR_DATA]
+
+SHOW_FLAVOR_FIELDS = [ID, NAME, DESCRIPTION, ENABLED, FLAVOR_PROFILE_ID]