lib: xmlParse{File,Memory} -> xmlRead{File,Memory}

Switch from xmlParse* to xmlRead* so we can explicitly specify parsing
flags, including no network usage and no entity resolution.
The two behaviours mentioned above were not done before either, so this
should not introduce behaviour changes in libguestfs.

src/launch-libvirt.c

@@ -611,7 +611,8 @@ parse_capabilities (guestfs_h *g, const char *capabilities_xml,
   size_t seen_qemu, seen_kvm;
   int force_tcg;
 
-  doc = xmlParseMemory (capabilities_xml, strlen (capabilities_xml));
+  doc = xmlReadMemory (capabilities_xml, strlen (capabilities_xml),
+                       NULL, NULL, XML_PARSE_NONET);
   if (doc == NULL) {
     error (g, _("unable to parse capabilities XML returned by libvirt"));
     return -1;

src/libvirt-domain.c

@@ -750,7 +750,8 @@ get_domain_xml (guestfs_h *g, virDomainPtr dom)
   }
 
   /* Parse the domain XML into an XML document. */
-  doc = xmlParseMemory (xml, strlen (xml));
+  doc = xmlReadMemory (xml, strlen (xml),
+                       NULL, NULL, XML_PARSE_NONET);
   if (doc == NULL) {
     error (g, _("unable to parse XML information returned by libvirt"));
     return NULL;

src/osinfo.c

@@ -269,7 +269,7 @@ read_osinfo_db_xml (guestfs_h *g, const char *filename)
 
   snprintf (pathname, pathname_len, "%s/%s", LIBOSINFO_DB_OS_PATH, filename);
 
-  doc = xmlParseFile (pathname);
+  doc = xmlReadFile (pathname, NULL, XML_PARSE_NONET);
   if (doc == NULL) {
     debug (g, "osinfo: unable to parse XML file %s", pathname);
     return 0;