(so user can use 'SO_REUSEADDR' option in tcp_server)

Conflicts:
	src/lua/bsdsocket.lua
	test/box/bsdsocket.result
	test/box/bsdsocket.test

update sophia submodule.

Clear errno for UNIX socket connections as well.

Make the formatting of the test output platform-independent.

Do not align maxalloc (the limit on the amount of memory
used by the allocator), it's not necessary.

Make an effort to correctly align large (for 32 bit) prealloc
values (like, a few gigs).