Pull up following revision(s) (requested by knakahara in ticket #829):

sys/net/if_l2tp.c: revision 1.24
sys/net/if_ipsec.c: revision 1.13
sys/net/if_gif.h: revision 1.31
sys/netipsec/ipsecif.c: revision 1.8
sys/net/if_gif.c: revision 1.140
sys/netinet6/in6_l2tp.c: revision 1.15
sys/net/if_ipsec.h: revision 1.3
sys/netinet6/in6_gif.c: revision 1.92
sys/net/if_l2tp.h: revision 1.5
sys/netinet/in_l2tp.c: revision 1.13
sys/netinet/in_gif.c: revision 1.93

Fix LOCKDEBUG kernel panic when many(about 200) tunnel interfaces is created.

The tunnel interfaces are gif(4), l2tp(4), and ipsecif(4). They use mutex
itself in percpu area. When percpu_cpu_enlarge() run, the address of the
mutex in percpu area becomes different from the address which lockdebug
saved. That can cause "already initialized" false detection.

(martin)