Changes to replace clagid setting in the bonding driver with -

1. clag_enable flag in the bonding driver
2. And clagid in clagd

Ticket: CM-4091
Reviewed By:
Testing Done: yes

1. Two new commands have been introduced in clagctl - setclagid and showclagid.
These commands will be used by ifupdown2 to set and read/check the clagid.
2. In addition a bit will be maintained per-bond in the bonding driver to
indicate if a bond is a CLAG bond.
(cherry picked from commit cb160bad45d330fe5f544d0d9a40c1c77b9b563f)

sbin/ifaddon

@@ -162,7 +162,8 @@ def man_rst_see_also():
     ip(8),
     mstpctl(8),
     brctl(8),
-    ethtool(8)'''
+    ethtool(8),
+    clagctl(8)'''
 
 def show_man_rst():
     man_rst_header()