lint: fix singleton-comparison

vppcfg/config/interface.py

@@ -791,7 +791,7 @@ def is_mpls(yaml, ifname):
     """Returns True if the interface exists and has mpls enabled. Returns false otherwise."""
     ifname, iface = get_by_name(yaml, ifname)
     try:
-        if iface["mpls"] == True:
+        if iface["mpls"]:
             return True
     except:
         pass

vppcfg/config/loopback.py

@@ -154,7 +154,7 @@ def is_mpls(yaml, ifname):
     """Returns True if the loopback exists and has mpls enabled. Returns false otherwise."""
     ifname, iface = get_by_name(yaml, ifname)
     try:
-        if iface["mpls"] == True:
+        if iface["mpls"]:
             return True
     except:
         pass