nightly testing: show source test results sorted by time

The Client::Source tests were sorted by name. This was confusing
because it hides when a peer like a CalDAV server stops responding
after a certain test.

It is more intuitive to present the results in the order in which they
were run. This is accomplished by sorting by the sub-second modification
time of the corresponding .log files (in resultschecker.py) and keeping
that order (in generate-html.xsl).

A similar approach might also be useful for Client::Sync. Not done yet.

test/generate-html.xsl

@@ -723,7 +723,8 @@
                         <th>Value</th>
                     </tr>
                     <xsl:for-each select="$source/*">
-                        <xsl:sort select="name(.)" data-type="text"/>
+                        <!-- do not sort here: unit tests are run in a certain order which may matter -->
+                        <!-- xsl:sort select="name(.)" data-type="text"/ -->
                         <tr>
                             <td width="300"><xsl:value-of select="name(.)"/></td>
                             <td width="20">

test/resultchecker.py

@@ -25,6 +25,9 @@ resultcheck.py: tranverse the test result directory, generate an XML
 based test report.
 """
 
+# sort more accurately on sub-second modification times
+os.stat_float_times(True)
+
 space="  "
 def check (resultdir, serverlist,resulturi, srcdir, shellprefix, backenddir):
     '''Entrypoint, resutldir is the test result directory to be generated,
@@ -221,7 +224,11 @@ def step2(resultdir, result, servers, indents, srcdir, shellprefix, backenddir):
             if(params[server].find('return code ') !=-1):
                 result.write('result="'+params[server].partition('return code ')[2].partition(')')[0]+'" ')
             result.write('>\n')
-            logs = glob.glob(resultdir+'/'+rserver+'/*.log')
+            # sort files by creation time, to preserve run order
+            logs = map(lambda file: (os.stat(file).st_mtime, file),
+                       glob.glob(resultdir+'/'+rserver+'/*.log'))
+            logs.sort()
+            logs = map(lambda entry: entry[1], logs)
             logdic ={}
             logprefix ={}
             for log in logs: