Rename two pcapng test files to .pcapng

Author: fxlb

tests/TESTLIST

@@ -59,12 +59,12 @@ bgp-evpn	bgp-evpn.pcap		bgp-evpn.out		-v
 bgp-llgr	bgp-evpn.pcap		bgp-llgr.out		-v
 bgp-encap	bgp-encap.pcap		bgp-encap.out		-v
 bgp-rt-prefix	bgp-rt-prefix.pcap	bgp-rt-prefix.out	-v
-bgp-extended-shutdown-msg	bgp-extended-shutdown-msg.pcap	bgp-extended-shutdown-msg.out	-v
+bgp-extended-shutdown-msg	bgp-extended-shutdown-msg.pcapng	bgp-extended-shutdown-msg.out	-v
 bgp-link-bw-extcommunity	bgp-link-bw-extcommunity.pcapng	bgp-link-bw-extcommunity.out	-v
 bgp-extended-msg	bgp-extended-msg.pcapng	bgp-extended-msg.out	-v
 bgp-enhanced-route-refresh	bgp-enhanced-route-refresh.pcapng	bgp-enhanced-route-refresh.out	-v
 bgp-enhanced-route-refresh-subtype	bgp-enhanced-route-refresh-subtype.pcapng	bgp-enhanced-route-refresh-subtype.out	-v
-bgp-extended-optional-parameters-length	bgp-extended-optional-parameters-length.pcap	bgp-extended-optional-parameters-length.out	-v
+bgp-extended-optional-parameters-length	bgp-extended-optional-parameters-length.pcapng	bgp-extended-optional-parameters-length.out	-v
 
 # Broadcom tag tests
 brcmtag		brcm-tag.pcap		brcm-tag.out