Update eos CLI vrf command

Replace "routing-context vrf" with "cli vrf" per Arista FN 0039

Author: bewing

napalm/eos/eos.py

@@ -1742,7 +1742,7 @@ def traceroute(
         commands = []
 
         if vrf:
-            commands.append("routing-context vrf {vrf}".format(vrf=vrf))
+            commands.append("cli vrf {vrf}".format(vrf=vrf))
 
         if source:
             source_opt = "-s {source}".format(source=source)
@@ -2248,7 +2248,7 @@ def ping(
         commands = []
 
         if vrf:
-            commands.append("routing-context vrf {vrf}".format(vrf=vrf))
+            commands.append("cli vrf {vrf}".format(vrf=vrf))
 
         command = "ping {}".format(destination)
         command += " timeout {}".format(timeout)