When we update the user info from pencil icon in User List,
data doesn't have 'project' attribute.
Therefore, date.pop('project') failed and exception occur.
The v2 API updates user model and default project separately.
And in User List, operator don't need to consider if a user
have a default tenant.
So we should check if data has a 'project' attribute and
if data has no 'project' attribute, it will update only user info.
Change-Id: I979bedeb8ddb15d3f7f171660ec9df4875edb53a
Closes-Bug: #1523343
6beefb3726