Sync Phase: Implement bondethernets

Include special caveat on LCP MAC changes, for which I'll put in a
TODO for now with a VPP comment {} with the to be run command.

Also make the user aware of a quick in BondEthernets not being able
to have link_mtu != 9000 so if a packet MTU > 9000 is set, this will
work but is an undesirable configuration. Issue a warning in this
case.

vppcfg

@@ -60,30 +60,26 @@ def main():
         sys.exit(-2)
 
     r = Reconciler(cfg)
-    if not r.readconfig():
-        logging.error("Couldn't read config from VPP")
-        sys.exit(-3)
-
     if not r.phys_exist(interface.get_phys(cfg)):
         logging.error("Not all PHYs in the config exist in VPP")
-        sys.exit(-4)
+        sys.exit(-3)
 
     if not r.prune():
         if not args.force:
             logging.error("Reconciliation prune failure")
-            sys.exit(-5)
+            sys.exit(-4)
         logging.warning("Reconciliation prune failure, continuing due to --force")
 
     if not r.create():
         if not args.force:
             logging.error("Reconciliation create failure")
-            sys.exit(-6)
+            sys.exit(-5)
         logging.warning("Reconciliation create failure, continuing due to --force")
 
     if not r.sync():
         if not args.force:
             logging.error("Reconciliation sync failure")
-            sys.exit(-7)
+            sys.exit(-6)
         logging.warning("Reconciliation sync failure, continuing due to --force")