Gorma master generates broken UpdateFrom method name on Goa master

[trevrosen]

NOTE: this is only an issue on post- v1.0.0 commits of Goa.

Reproducing

1. Create a multi-word resource named foo_bar with create and update actions
2. Create a model called FooBar
3. Create a user type called foo_bar
4. Declare a BuildsFrom in the FooBar model for both the create and update actions
5. Generate all the things!
6. Add a call to models.UpdateFromUpdateFooBarPayload to one of your controllers
7. Attempt to start the server

Result

Server will not boot because the update method has not been generated. Open models/foobar.go and note that the storage interface contains the ersatz function name UpdateFromfoo_bar

Helpful info

• The Create companion method seems to generate fine -- it's just the Update one that is borked.
• This Goa commit appears to introduce the change which triggers this behavior: 35d91a4a4e9ec630f4cb3dea33c897cd2c8b6259