hst/config: remove container etc field

This no longer needs special treatment since it can be specified as a generic filesystem entry.

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

hst/hst_test.go

@@ -109,6 +109,12 @@ func TestTemplate(t *testing.T) {
 				"write": true,
 				"special": true
 			},
+			{
+				"type": "bind",
+				"dst": "/etc/",
+				"src": "/etc/",
+				"special": true
+			},
 			{
 				"type": "ephemeral",
 				"dst": "/tmp/",
@@ -154,9 +160,7 @@ func TestTemplate(t *testing.T) {
 				"target": "/run/user/65534",
 				"linkname": "/run/user/150"
 			}
-		],
-		"etc": "/etc/",
-		"auto_etc": true
+		]
 	}
 }`