The `Get` method on the UsersStore was generalize by changing the second
parameter to a struct. This allows the Store to retrieve users by more
than simply their name.
-Get(ctx context.Context, name string) (*User, error)
+Get(ctx context.Context, q UserQuery) (*User, error)
Move source Users code into source_users and source_users_test files.
Use the UsersStore for both InfluxDB and Chronograf users.
Signed-off-by: Michael de Sa <mjdesa@gmail.com>
Jared Scheib
Michael Desa
Chris Goller