network: Make tcfilter model as default

tcfilter requires no changes to the interface provided by the network
plugin and supports a larger set of plugins.

Fixes kata-containers#1501

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

Makefile

@@ -213,7 +213,7 @@ ifneq (,$(QEMUCMD))
 
     # qemu-specific options (all should be suffixed by "_QEMU")
     DEFBLOCKSTORAGEDRIVER_QEMU := virtio-scsi
-    DEFNETWORKMODEL_QEMU := macvtap
+    DEFNETWORKMODEL_QEMU := tcfilter
     KERNELNAME_QEMU = $(call MAKE_KERNEL_NAME,$(KERNELTYPE))
     KERNELPATH_QEMU = $(KERNELDIR)/$(KERNELNAME_QEMU)
 endif