Rename and support single nxos interface switchport (#1889)

Author: mjbear

…_nxos_show_interfaces_switchport.textfsm …o_nxos_show_interface_switchport.textfsmntc_templates/templates/cisco_nxos_show_interfaces_switchport.textfsm renamed to ntc_templates/templates/cisco_nxos_show_interface_switchport.textfsm ntc_templates/templates/cisco_nxos_show_interfaces_switchport.textfsm renamed to ntc_templates/templates/cisco_nxos_show_interface_switchport.textfsm

@@ -378,12 +378,12 @@ cisco_nxos_show_interface_snmp-ifindex.textfsm, .*, cisco_nxos, sh[[ow]] int[[er
 cisco_nxos_show_forwarding_ipv4_route.textfsm, .*, cisco_nxos, sh[[ow]] fo[[rwarding]] ipv4 ro[[ute]]
 cisco_nxos_show_interface_description.textfsm, .*, cisco_nxos, sh[[ow]] int[[erface]] desc[[ription]]
 cisco_nxos_show_interface_transceiver.textfsm, .*, cisco_nxos, sh[[ow]] int[[erface]] tra[[nsceiver]]
-cisco_nxos_show_interfaces_switchport.textfsm, .*, cisco_nxos, sh[[ow]] int[[erfaces]] sw[[itchport]]
 cisco_nxos_show_ip_arp_detail_vrf_all.textfsm, .*, cisco_nxos, sh[[ow]] i[[p]] a[[rp]] det[[ail]] vrf all
 cisco_nxos_show_ip_dhcp_relay_address.textfsm, .*, cisco_nxos, sh[[ow]] ip dh[[cp]] r[[elay]] a[[ddress]]
 cisco_nxos_show_lldp_neighbors_detail.textfsm, .*, cisco_nxos, sh[[ow]] ll[[dp]] nei[[ghbors]] d[[etail]]
 cisco_nxos_show_cdp_neighbors_detail.textfsm, .*, cisco_nxos, sh[[ow]] c[[dp]] neig[[hbors]] det[[ail]]
 cisco_nxos_show_forwarding_adjacency.textfsm, .*, cisco_nxos, sh[[ow]] fo[[rwarding]] (?:ipv4 )?ad[[jacency]]
+cisco_nxos_show_interface_switchport.textfsm, .*, cisco_nxos, sh[[ow]] int[[erface]](\s+.+)? sw[[itchport]]
 cisco_nxos_show_ip_interface_vrf_all.textfsm, .*, cisco_nxos, sh[[ow]] ip interf[[ace]] v[[rf]] a[[ll]]
 cisco_nxos_show_ipv6_interface_brief.textfsm, .*, cisco_nxos, sh[[ow]] ipv[[6]] interf[[ace]] b[[rief]]
 cisco_nxos_show_port-channel_summary.textfsm, .*, cisco_nxos, sh[[ow]] po[[rt-channel]] sum[[mary]]