ci: fix testing of xapi-xenstored in newer opam's sandboxes #4688
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xs-opam's CI is the only environment where /tmp is not writable and
XDG_RUNTIME_DIR is not set. Using TMPDIR with /tmp as a backup will mean
the socket is writeable in all environments
xs-opam's CI successfuly passes with this branch: https://github.com/psafont/xs-opam/runs/6075835428?check_suite_focus=true