The vpp control plane thread generates different types of packets such as ARP,
DHCP client, IPv6 RA, etc. which need to go through HQoS thread associated
with the output interfaces. Therefore, this patch enables vpp main thread
connection with the HQoS thread through dedicated SWQ.
Change-Id: Idcb759546d4bcd9b40beedaec4f12b29baae3e40
Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>