qgs: add -m=MODE parameter for UNIX socket mode #451
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The UNIX socket mode default is controlled by the process umask, but it can be desirable to override this to open up the socket mode, while keeping the umask restrictive.
For example, to allow QEMU to connect to the socket, it needs to be world accessible, while the default umask of 0700 set by systemd will normally limit its access to only the qgs user.