i=isaac
acceptor.c cleanup:
 - removed code duplication in acceptor.c for the cases of kernel
   and user-space code
 - uniformed user-space libcfs tcpip primitives to have prototypes
   similar to kernel ones
 - removed parse_int_tunable() from libcfs to lnet because it's not
   generic enough to reside in libcfs
 - untabified and removed trailing spaces in files touched
 - minor cosmetic changes in usocklnd becasue now a socket is
   represented with cfs_socket_t structure and should be released
   properly (just close(fd) is not ehough).