add decision on 746578

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+===== TITLE
+
+libpam-systemd to switch alternate dependency ordering
+
+===== WEB SUMMARY
+
+The committee decided that systemd-shim should be the first listed
+alternative dependency.
+
+===== EMAIL INTRO
+
+The technical committe was asked in #746578 to override the ordering
+of the alternative dependencies on systemd-sysv and systemd-shim to
+prefer the installation of systemd-shim in cases where sysvinit-core
+was already installed.
+
+===== EMAIL EPILOGUE
+
+The committee would like to thank everyone who participated in the
+discussion of #746578, especially Josh Triplett, Serge Hallyn, Sam
+Hartman, Cameron Norman, and Michael Biebl.
+
+===== DECISION
+
+Rationale (Constitution 6.1(5)):
+
+1. Currently libpam-systemd (which is pulled in by quite a few
+   dependency chains) Depends on `systemd-sysv | systemd-shim (>= 8-2)'.
+
+2. The effect of this is that installing some packages which depend
+   (directly or indirectly) on libpam-systemd can cause a user's init
+   system to be switched to systemd, even on systems where a user has
+   deliberately chosen not to use the default init system, and even
+   when the switch is unnecessary.
+
+3. Swappping the order of these dependencies would avoid that and has
+   no harmful effect:
+
+4. In particular, on systems that already have systemd-sysv installed,
+   libpam-systemd will still not pull in systemd-shim, thus minimizing
+   the risk of breakage on systemd systems.  However, on systems that
+   intentionally do not have systemd-sysv installed, the installation
+   of libpam-systemd will then prefer to pull in systemd-shim and keep
+   the installed init system rather than switching to systemd-sysv.
+
+Decision (Constitution 6.1(4)):
+
+5. We therefore overrule the decision of the maintainer of
+   libpam-systemd binary package.  The Depends entry
+      systemd-sysv | systemd-shim (>= 8-2)
+   should be replaced by
+      systemd-shim (>= 8-2) | systemd-sysv
+
+6. For the avoidance of doubt, we do not intend to set this specific
+   syntax in stone.  For example, if in future libpam-systemd needs to
+   depend on a later systemd-shim, or needs a versioned rather than
+   unversioned dependency on systemd-sysv, that is fine and would not
+   contradict our decision.
+
+Release (Constitution 6.1(5)):
+
+7. Our advice is that this change should be in jessie.  If necessary,
+   this view should be conveyed to the Release Team, after the change
+   is in unstable, by filing an unblock request in the usual way.