[processing] Return log lines from GdalUtils.runGdal instead of storing

in a class member

The previous approach was NOT thread safe, and it's easy to avoid

python/plugins/processing/algs/gdal/GdalUtils.py

@@ -97,8 +97,7 @@ def runGdal(commands, feedback=None):
         success = False
         retry_count = 0
         while not success:
-            loglines = []
-            loglines.append(GdalUtils.tr('GDAL execution console output'))
+            loglines = [GdalUtils.tr('GDAL execution console output')]
             try:
                 with subprocess.Popen(
                     fused_command,
@@ -121,11 +120,7 @@ def runGdal(commands, feedback=None):
                             len(loglines), u'\n'.join(loglines[-10:])))
 
             QgsMessageLog.logMessage('\n'.join(loglines), 'Processing', Qgis.Info)
-            GdalUtils.consoleOutput = loglines
-
-    @staticmethod
-    def getConsoleOutput():
-        return GdalUtils.consoleOutput
+        return loglines
 
     @staticmethod
     def getSupportedRasters():

python/plugins/processing/algs/gdal/gdalinfo.py

@@ -115,11 +115,11 @@ def getConsoleCommands(self, parameters, context, feedback, executing=True):
         return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
 
     def processAlgorithm(self, parameters, context, feedback):
-        GdalUtils.runGdal(self.getConsoleCommands(parameters, context, feedback), feedback)
+        console_output = GdalUtils.runGdal(self.getConsoleCommands(parameters, context, feedback), feedback)
         output = self.parameterAsFileOutput(parameters, self.OUTPUT, context)
         with open(output, 'w') as f:
             f.write('<pre>')
-            for s in GdalUtils.getConsoleOutput()[1:]:
+            for s in console_output[1:]:
                 f.write(str(s))
             f.write('</pre>')
 

python/plugins/processing/algs/gdal/ogrinfo.py

@@ -85,11 +85,11 @@ def getConsoleCommands(self, parameters, context, feedback, executing=True):
         return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
 
     def processAlgorithm(self, parameters, context, feedback):
-        GdalUtils.runGdal(self.getConsoleCommands(parameters, context, feedback), feedback)
+        console_output = GdalUtils.runGdal(self.getConsoleCommands(parameters, context, feedback), feedback)
         output = self.parameterAsFileOutput(parameters, self.OUTPUT, context)
         with open(output, 'w') as f:
             f.write('<pre>')
-            for s in GdalUtils.getConsoleOutput()[1:]:
+            for s in console_output[1:]:
                 f.write(str(s))
             f.write('</pre>')