bgpd: Add new configuration cli for eBGP and iBGP multipath.
There is support to configure this for each (AFI,SAFI), but
currently this configuration is only present for IPv4 unicast:

 maximum-paths [ibgp] <1-255>
 no maximum-paths [ibgp] [<1-255>]

* bgpd/Makefile.am
  * Add bgp_mpath.h and bgp_mpath.c to build
* bgpd/bgp_mpath.h
  * New file for bgp multipath declarations
  * define BGP_DEFAULT_MAXPATHS
* bgpd/bgp_mpath.c
  * bgp_maximum_paths_set(): Configure maximum paths for the given
    afi, safi and bgp instance
  * bgp_maximum_paths_unset(): Return maximum paths configuration to
    the default setting for the given afi, safi and bgp instance
* bgpd/bgp_vty.c
  * Define command strings for above CLI
  * bgp_config_write_maxpaths(): Outputs configuration for the given
    afi, safi and bgp instance
  * Install command elements for IPv4 unicast
* bgpd/bgp_zebra.h
  * bgp_config_write_maxpaths(): External declaration
* bgpd/bgpd.c
  * bgp_create(): Initialize bgp instance to default maximum paths setting
  * bgp_config_write_family(): Output maximum paths configuration
    for the given address family
  * bgp_config_write(): Output maximum paths configuration for
    IPv4 unicast address family
* bgpd/bgpd.h
  * struct bgp: Add storage for maximum paths configuration for
    each afi, safi
diff --git a/bgpd/bgp_zebra.h b/bgpd/bgp_zebra.h
index bd95386..5172cb8 100644
--- a/bgpd/bgp_zebra.h
+++ b/bgpd/bgp_zebra.h
@@ -23,6 +23,8 @@
 
 extern void bgp_zebra_init (void);
 extern int bgp_if_update_all (void);
+extern int bgp_config_write_maxpaths (struct vty *, struct bgp *, afi_t,
+				      safi_t, int *);
 extern int bgp_config_write_redistribute (struct vty *, struct bgp *, afi_t, safi_t,
 				   int *);
 extern void bgp_zebra_announce (struct prefix *, struct bgp_info *, struct bgp *);