Fix compatibility with procps 4.

Negative UIDs are no longer allowed.  Use a very high one instead.

Taken from upstream:

  https://github.com/ganeti/ganeti/commit/9cd67e6a81c66ed326d68ea8c3241d14eea6550b

diff --git a/test/py/ganeti.uidpool_unittest.py b/test/py/ganeti.uidpool_unittest.py
index b2f5bc5cf2..2d9227cbf5 100755
--- a/test/py/ganeti.uidpool_unittest.py
+++ b/test/py/ganeti.uidpool_unittest.py
@@ -106,23 +106,24 @@ def testRequestUnusedUid(self):
 
     # Check with a single, known unused user-id
     #
-    # We use "-1" here, which is not a valid user-id, so it's
-    # guaranteed that it's unused.
-    uid = uidpool.RequestUnusedUid(set([-1]))
-    self.assertEqualValues(uid.GetUid(), -1)
+    # We use 2^30+42 here, which is a valid UID, but unlikely to be used on
+    # most systems (even as a subuid).
+    free_uid = 2**30 + 42
+    uid = uidpool.RequestUnusedUid(set([free_uid]))
+    self.assertEqualValues(uid.GetUid(), free_uid)
 
     # Check uid-pool exhaustion
     #
-    # uid "-1" is locked now, so RequestUnusedUid is expected to fail
+    # free_uid is locked now, so RequestUnusedUid is expected to fail
     self.assertRaises(errors.LockError,
                       uidpool.RequestUnusedUid,
-                      set([-1]))
+                      set([free_uid]))
 
     # Check unlocking
     uid.Unlock()
     # After unlocking, "-1" should be available again
-    uid = uidpool.RequestUnusedUid(set([-1]))
-    self.assertEqualValues(uid.GetUid(), -1)
+    uid = uidpool.RequestUnusedUid(set([free_uid]))
+    self.assertEqualValues(uid.GetUid(), free_uid)
 
 
 if __name__ == "__main__":
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<div class='path'>path: <a href='/guix/log/?id=ad1664f8987f36c6efa0b2f82cc54e31cce38ede'>root</a>/<a href='/guix/log/gnu?id=ad1664f8987f36c6efa0b2f82cc54e31cce38ede'>gnu</a>/<a href='/guix/log/gnu/system?id=ad1664f8987f36c6efa0b2f82cc54e31cce38ede'>system</a>/<a href='/guix/log/gnu/system/privilege.scm?id=ad1664f8987f36c6efa0b2f82cc54e31cce38ede'>privilege.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/system/privilege.scm?id=ad1664f8987f36c6efa0b2f82cc54e31cce38ede&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-09-08 02:00:00 +0200'>2024-09-08</span></td><td><a href='/guix/commit/gnu/system/privilege.scm?id=0dd8e4c35109ed8bc2406a0bc13e18823a334937'>privilege: Add file-like-&gt;setuid-program helper.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/privilege.scm (file-like-&gt;setuid-program): New public
procedure.
* gnu/system/setuid.scm: Re-export it for compatibility.
(file-like-&gt;setuid-program): Remove this old version.
* gnu/services/docker.scm (singularity-setuid-programs): Use it (again).
* gnu/services/desktop.scm (enlightenment-privileged-programs): Likewise.

Change-Id: I8e41144438677a15cdadb3063651dbc780715497
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2024-08-11 02:00:00 +0200'>2024-08-11</span></td><td><a href='/guix/commit/gnu/system/privilege.scm?id=71f0676a295841e2cc662eec0d3e9b7e69726035'>privilege: Add POSIX capabilities(7) support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/privilege.scm (&lt;privileged-program&gt;): Add a field
representing the program's POSIX capabilities.
(privileged-program-capabilities): New public procedure.
* doc/guix.texi (Privileged Programs): Document it.
* gnu/build/activation.scm (activate-privileged-programs): Take a LIBCAP
package argument providing setcap(8) to apply said capabilities.
* gnu/services.scm (privileged-program-&gt;activation-gexp): Pass said
package argument where supported.  Include privileged-program-capabilities
in the compatibility hack.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2024-08-11 02:00:00 +0200'>2024-08-11</span></td><td><a href='/guix/commit/gnu/system/privilege.scm?id=39471f2627bd63df0e9af02a46e5dda60e233ffc'>system: Add (gnu system privilege).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/privilege.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
03952be99419b958e98e5934fb3b86f71165d'>maint: update-NEWS: Don't produce full package lists.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
The lists of new and upgraded packages in 'NEWS' had become way too long
and redundant with what 'guix pull' reports.

* build-aux/update-NEWS.scm (write-packages-added): Don't print ADDED.
(write-packages-updates)[important, table, latest, noteworthy]: New
variables.
Print NOTEWORTHY rather than all of UPGRADED.
(main): Print PREVIOUS-VERSION and NEW-VERSION.


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