Create flavor-access for the tenant when creating
a private flavor

In FlavorManage extension, a change has been made to
create flavor-access for a corresponding tenant on
creating a private flavor

This also requires the api-samples for flavor-access
to be changed, since there will be a flavor-access created
by default on creating a private flavor

This commit has a DocImpact

Change-Id: I7795fbd04ae9fc8b1ea6fb27203dfa5217d310ce
Fixes: bug 1209101
Merge "Create flavor-access for the tenant when creating a private flavor"