MINOR: vars: Add 'unset-var' action/converter
It does the opposite of 'set-var' action/converter. It is really useful for
per-process variables. But, it can be used for any scope.
The lua function 'unset_var' has also been added.
diff --git a/include/proto/vars.h b/include/proto/vars.h
index 8414baa..6152f5c 100644
--- a/include/proto/vars.h
+++ b/include/proto/vars.h
@@ -9,6 +9,8 @@
int vars_get_by_name(const char *name, size_t len, struct sample *smp);
void vars_set_by_name_ifexist(const char *name, size_t len, struct sample *smp);
void vars_set_by_name(const char *name, size_t len, struct sample *smp);
+void vars_unset_by_name_ifexist(const char *name, size_t len, struct sample *smp);
+void vars_unset_by_name(const char *name, size_t len, struct sample *smp);
int vars_get_by_desc(const struct var_desc *var_desc, struct sample *smp);
int vars_check_arg(struct arg *arg, char **err);