parse: do not escape all non-ascii bytes

g_strescape will transform utf-8 strings in a sequence of escaped octal
numbers in form of a string. That happens because g_strescape will
escape the range from 0x7f to 0xff.

For example, "áéí" will become "\\303\\241\\303\\251\\303\\255". Pure
ASCII strings are not affected by it.

Add all the range 0x7f-0xff to the exception list.

src/parse.c

@@ -59,8 +59,20 @@
  * Quotes are escaped at configuration generation time as needed, as they might be part of passwords for example.
  * Escaping backslashes in the parser affects "netplan set" as it will always escape \'s from
  * the input and update YAMLs with all the \'s escaped again.
+ *
+ * g_strescape will also escape all the non-ascii chars in the range 0x7f-0xff. This affects non-ascii
+ * strings and will break utf-8 strings for example. So we add the entire range to the list of exceptions.
 */
-static char* STRESCAPE_EXCEPTIONS = "\"\\";
+static char* STRESCAPE_EXCEPTIONS =
+    "\"\\"
+    "\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90"
+    "\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2"
+    "\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4"
+    "\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6"
+    "\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8"
+    "\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea"
+    "\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc"
+    "\xfd\xfe\xff";
 
 STATIC gboolean
 insert_kv_into_hash(void *key, void *value, void *hash);