[Bug 2660] New: Create mux socket for regress in temp directory

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2660

            Bug ID: 2660
           Summary: Create mux socket for regress in temp directory
           Product: Portable OpenSSH
           Version: 7.4p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Regression tests
          Assignee: unassigned-bugs at mindrot.org
          Reporter: cjwatson at debian.org

Created attachment 2926
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2926&action=edit
Create mux socket for regress in temp directory

In some setups, creating the socket under OBJ may result in a path that
is too long for a Unix domain socket.  The failure in
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-zesty/zesty/s390x/o/openssh/20170103_003152_0b07a@/log.gz
was due to this.

While of course it's possible to say that everyone must ensure that OBJ
is short enough to avoid exceeding this limit, the limit is quite low
at least on Linux (108 characters), and it would seem friendlier to
create a temporary directory instead so that it's more likely to fit. 
Patch attached (which overlaps a bit with that in
https://bugzilla.mindrot.org/show_bug.cgi?id=2659, but not terribly).

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