xl: enable hap, parse hap option in the config files

This simple patch enables hap by default in xl and also allows xl to
parse the hap option in the VM config file.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

tools/libxl/xl_cmdimpl.c

@@ -160,6 +160,7 @@ static void init_create_info(libxl_domain_create_info *c_info)
     memset(c_info, '\0', sizeof(*c_info));
     c_info->xsdata = NULL;
     c_info->platformdata = NULL;
+    c_info->hap = 1;
     c_info->hvm = 1;
     c_info->oos = 1;
     c_info->ssidref = 0;
@@ -441,7 +442,9 @@ static void parse_config_data(const char *configfile_filename_report,
         !strncmp(buf, "hvm", strlen(buf)))
         c_info->hvm = 1;
 
-    /* hap is missing */
+    if (!xlu_cfg_get_long (config, "hap", &l))
+        c_info->hap = l;
+
     if (!xlu_cfg_get_string (config, "name", &buf))
         c_info->name = strdup(buf);
     else