Rewrite Linuxulator struct sockaddr conversion funtions

[dchagin]

Summary

Our bsd_to_linux_sockaddr() and linux_to_bsd_sockaddr() functions
alter the userspace sockaddr to convert the format between linux and BSD versions.
That's the minimum 3 of copyin/copyout operations for one syscall.

Also some syscall uses linux_sa_put() and linux_getsockaddr() when load
sockaddr to userspace or from userspace accordingly.

To avoid this, chaos especially converting sockaddr in the userspace,
rewrite these 4 functions to convert sockaddr only in kernel and leave
only 2 of this functions.

Also in order to reduce duplication between MD parts of the Linuxulator move
struct sockaddr conversion functions that are MI out into linux_common module.

PR: 232920

[dchagin]

accept syscall return EINVAL in case of negative namelen parameter

[dchagin]

refactor accept_common to properly handle error from kern_accept4

[dchagin]

Init bflags in linux_accept_common and lsa in bsd_to_linux_sockaddr.

[dchagin]

ha, git show HEAD^ )))

fixed linux_accept_common after refactoring

[dchagin]

do not touch linux_recv()

[dchagin]

as linux_common now depends on INET6 option, fix it