Sort the ecode list in the gnt-cluster manual for deterministic results.

Submitted upstream: <https://github.com/ganeti/ganeti/pull/1504>.

diff --git a/lib/build/sphinx_ext.py b/lib/build/sphinx_ext.py
--- a/lib/build/sphinx_ext.py
+++ b/lib/build/sphinx_ext.py
@@ -108,7 +108,7 @@ CV_ECODES_DOC = "ecodes"
 # pylint: disable=W0621
 CV_ECODES_DOC_LIST = [(name, doc) for (_, name, doc) in constants.CV_ALL_ECODES]
 DOCUMENTED_CONSTANTS = {
-  CV_ECODES_DOC: CV_ECODES_DOC_LIST,
+  CV_ECODES_DOC: sorted(CV_ECODES_DOC_LIST, key=lambda tup: tup[0]),
   }
 
 
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<tr><td><span title='2021-09-18 19:37:45 +0200'>2021-09-18</span></td><td><a href='/guix/commit/tests/import-git.scm?id=59ee10754eddddb99e4a80b9e18aa12ed1b3d77a'>import: Add 'generic-git' updater.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/git.scm (ls-remote-refs): New procedure.
* tests/git.scm ("remote-refs" "remote-refs: only tags"): New tests.
* guix/import/git.scm: New file.
* doc/guix.texi (Invoking guix refresh): Document it.
* tests/import-git.scm: New test file.
* Makefile.am (MODULES, SCM_TESTS): Register the new files.

Co-authored-by: Sarah Morgensen &lt;iskarian@mgsn.dev&gt;
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Xinglu Chen</td></tr>