admin: Introduce some public constants related to server's client limits

In order for typed params validation to pass on daemon side, we should
encourage users to use our exported constants with typed params to diminish
to avoid any potential problems related to argument validity.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

include/libvirt/libvirt-admin.h

@@ -351,6 +351,48 @@ int virAdmClientGetInfo(virAdmClientPtr client,
 
 int virAdmClientClose(virAdmClientPtr client, unsigned int flags);
 
+/* Manage per-server client limits */
+
+/**
+ * VIR_SERVER_CLIENTS_MAX:
+ * Macro for per-server nclients_max limit: represents the upper limit to
+ * number of clients connected to the server, as uint.
+ */
+
+# define VIR_SERVER_CLIENTS_MAX "nclients_max"
+
+/**
+ * VIR_SERVER_CLIENTS_CURRENT:
+ * Macro for per-server nclients attribute: represents the current number of
+ * clients connected to the server, as VIR_TYPED_PARAM_UINT.
+ *
+ * NOTE: This attribute is read-only and any attempt to set it will be denied
+ * by daemon
+ */
+
+# define VIR_SERVER_CLIENTS_CURRENT "nclients"
+
+/**
+ * VIR_SERVER_CLIENTS_UNAUTH_MAX:
+ * Macro for per-server nclients_unauth_max limit: represents the upper limit
+ * to number of clients connected to the server, but not authenticated yet,
+ * as VIR_TYPED_PARAM_UINT.
+ */
+
+# define VIR_SERVER_CLIENTS_UNAUTH_MAX "nclients_unauth_max"
+
+/**
+ * VIR_SERVER_CLIENTS_UNAUTH_CURRENT:
+ * Macro for per-server nclients_unauth attribute: represents the current
+ * number of clients connected to the server, but not authenticated yet,
+ * as VIR_TYPED_PARAM_UINT.
+ *
+ * NOTE: This attribute is read-only and any attempt to set it will be denied
+ * by daemon
+ */
+
+# define VIR_SERVER_CLIENTS_UNAUTH_CURRENT "nclients_unauth"
+
 # ifdef __cplusplus
 }
 # endif