Use bcopy instead of strlcpy in uipc_bind and unp_connect, since

Use bcopy instead of strlcpy in uipc_bind and unp_connect, since
soun->sun_path isn't a null-terminated string.  As UNIX(4) states, "the
terminating NUL is not part of the address."  Since strlcpy has to return
"the total length of the string [it] tried to create," it walks off the end
of soun->sun_path looking for a \0.

This reverts r105332.

Reported by:    Ryan Stone