examples: Resurrect domsuspend example

This partially reverts 5eb4b04211 and 62774afb6b.

Rewrite the domsuspend example from scratch. This time do it right.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

cfg.mk

@@ -1003,7 +1003,7 @@ exclude_file_name_regexp--sc_prohibit_sprintf = \
 exclude_file_name_regexp--sc_prohibit_strncpy = ^src/util/virstring\.c$$
 
 exclude_file_name_regexp--sc_prohibit_strtol = \
-  ^src/(util/virsexpr|(vbox|xen|xenxs)/.*)\.c$$
+  ^(src/(util/virsexpr|(vbox|xen|xenxs)/.*)\.c)|(examples/domsuspend/suspend.c)$$
 
 exclude_file_name_regexp--sc_prohibit_xmlGetProp = ^src/util/virxml\.c$$