hst/fs: remove type method

Having a method that returns the canonical string representation of its type seemed like a much better idea for an implementation that never made it to staging. Remove it here and clean up marshal type assertions.

Signed-off-by: Ophestra <cat@gensokyo.uk>

hst/fsephemeral.go

@@ -25,8 +25,7 @@ type FSEphemeral struct {
 	Perm os.FileMode `json:"perm,omitempty"`
 }
 
-func (e *FSEphemeral) Type() string { return FilesystemEphemeral }
-func (e *FSEphemeral) Valid() bool  { return e != nil && e.Dst != nil }
+func (e *FSEphemeral) Valid() bool { return e != nil && e.Dst != nil }
 
 func (e *FSEphemeral) Target() *container.Absolute {
 	if !e.Valid() {