[sflow] Add mVRF support (#5904)

* Bump hsFlowD version to 2.0.28-02 to support mVRF

Signed-off-by: Garrick He <garrick_he@dell.com>

rules/sflow.mk

@@ -1,7 +1,7 @@
 # host-sflow package
 
-HSFLOWD_VERSION = 2.0.26
-HSFLOWD_SUBVERSION = 4
+HSFLOWD_VERSION = 2.0.28
+HSFLOWD_SUBVERSION = 2
 export HSFLOWD_VERSION HSFLOWD_SUBVERSION
 
 HSFLOWD = hsflowd_$(HSFLOWD_VERSION)-$(HSFLOWD_SUBVERSION)_$(CONFIGURED_ARCH).deb