dccp: build fixes, mdb (vfs sonode missing)

*** 4079,4089 ****
          /* from net.c */
          { "dladm", "?<sub-command> [flags]", "show data link information",
                  dladm, dladm_help },
          { "mi", ":[-p] [-d | -m]", "filter and display MI object or payload",
                  mi },
!         { "netstat", "[-arv] [-f inet | inet6 | unix] [-P tcp | udp | icmp]",
                  "show network statistics", netstat },
          { "sonode", "?[-f inet | inet6 | unix | #] "
                  "[-t stream | dgram | raw | #] [-p #]",
                  "filter and display sonode", sonode },
  
--- 4079,4089 ----
          /* from net.c */
          { "dladm", "?<sub-command> [flags]", "show data link information",
                  dladm, dladm_help },
          { "mi", ":[-p] [-d | -m]", "filter and display MI object or payload",
                  mi },
!         { "netstat", "[-arv] [-f inet | inet6 | unix] [-P tcp | udp | icmp | dccp]",
                  "show network statistics", netstat },
          { "sonode", "?[-f inet | inet6 | unix | #] "
                  "[-t stream | dgram | raw | #] [-p #]",
                  "filter and display sonode", sonode },
  
*** 4478,4487 ****
--- 4478,4489 ----
                  icmp_stacks_walk_init, icmp_stacks_walk_step, NULL },
          { "tcp_stacks", "walk all the tcp_stack_t",
                  tcp_stacks_walk_init, tcp_stacks_walk_step, NULL },
          { "udp_stacks", "walk all the udp_stack_t",
                  udp_stacks_walk_init, udp_stacks_walk_step, NULL },
+         { "dccp_stacks", "walk all the dccp_stack_t",
+                 dccp_stacks_walk_init, dccp_stacks_walk_step, NULL },
  
          /* from netstack.c */
          { "netstack", "walk a list of kernel netstacks",
                  netstack_walk_init, netstack_walk_step, NULL },