Properly handle uneditable key types in EditKeyFragment

More specifically, return an OperationResultParcel for stripped and
divert-to-card keys, with an appropriate error message in the log.

part of #828

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/OperationResultParcel.java

@@ -427,6 +427,12 @@ public class OperationResultParcel implements Parcelable {
         MSG_CON_SUCCESS (R.string.msg_con_success),
         MSG_CON_WARN_DELETE_PUBLIC (R.string.msg_con_warn_delete_public),
         MSG_CON_WARN_DELETE_SECRET (R.string.msg_con_warn_delete_secret),
+
+        // messages used in UI code
+        MSG_EK_ERROR_DIVERT (R.string.msg_ek_error_divert),
+        MSG_EK_ERROR_DUMMY (R.string.msg_ek_error_dummy),
+        MSG_EK_ERROR_NOT_FOUND (R.string.msg_ek_error_not_found),
+
         ;
 
         private final int mMsgId;