Use an alias for CNS client paths

These really should be a single set of paths, but there's this existing
block of constants to define a "contract with DNC." Whether or not
that's complete, the spirit of it is somewhat clear. However, it's not
great to be duplicating constants all over the place. This is somewhat
of a compromise by defining the newer constants in terms of the older
ones.

cns/NetworkContainerContract.go

@@ -29,8 +29,8 @@ const (
 	PathDebugIPAddresses                     = "/debug/ipaddresses"
 	PathDebugPodContext                      = "/debug/podcontext"
 	PathDebugRestData                        = "/debug/restdata"
-	NumberOfCPUCores                         = "/hostcpucores"
-	NMAgentSupportedAPIs                     = "/network/nmagentsupportedapis"
+	NumberOfCPUCores                         = NumberOfCPUCoresPath
+	NMAgentSupportedAPIs                     = NmAgentSupportedApisPath
 )
 
 // NetworkContainer Prefixes