a new patch to set the umask for the AF_UNIX socket

[肖群健]

 Hi, Attached is a new patch, which introduces an option(SockUmask) for sshd and ssh and a command line argument(-m) for ssh-agent. Those options are used to specify the umask for the AF_UNIX socket. Currently, ssh-agent, ssh and sshd use the system umask for the AF_UNIX socket, however, this is lack of flexibility in some cases for security considerations, that's why I provide the patch. Would you please take a look and see if it could be used in the next openssh release? Thanks Xiao
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