fix: Configurable survey server downtime

There are now three different functions used to download surveys from
three different server types: ODK, kobotoolbox and WRSIS. All three
functions can use past downloads if there is no connection currently, but
they have different hard-coded settings. This fix makes them
consistent and configurable with the config parameter
['Survey']['AcceptableDowntimeDays'].

ProcessorComponents.py

@@ -360,7 +360,10 @@ def get_ODK_form_as_csv(form_credentials: dict, jobPath: str, config: dict, stat
         ODK_copy_success = False
 
         days_back = 1
-        while ((not ODK_copy_success) and (days_back <= 21)):
+        acceptable_days_back = int(config['Survey']['AcceptableDowntimeDays'])
+        logger.debug(f"Acceptable server downtime is set to {acceptable_days_back} days")
+
+        while ((not ODK_copy_success) and (days_back <= acceptable_days_back)):
             current_date = datetime.datetime.strptime(config['StartString'],'%Y%m%d')
 
             past_date = current_date - datetime.timedelta(days=days_back)
@@ -700,7 +703,10 @@ def get_kobotoolbox_form_as_csv(form_credentials: dict, jobPath: str, config: di
         copy_success = False
 
         days_back = 1
-        while ((not copy_success) and (days_back <= 7)):
+        acceptable_days_back = int(config['Survey']['AcceptableDowntimeDays'])
+        logger.debug(f"Acceptable server downtime is set to {acceptable_days_back} days")
+
+        while ((not copy_success) and (days_back <= acceptable_days_back)):
 
             current_date = datetime.datetime.strptime(config['StartString'],'%Y%m%d')
 
@@ -964,7 +970,10 @@ def get_WRSIS_form_as_csv(form_credentials: dict, jobPath: str, config: dict, st
         copy_success = False
 
         days_back = 1
-        while ((not copy_success) and (days_back <= 7)):
+        acceptable_days_back = int(config['Survey']['AcceptableDowntimeDays'])
+        logger.debug(f"Acceptable server downtime is set to {acceptable_days_back} days")
+
+        while ((not copy_success) and (days_back <= acceptable_days_back)):
 
             current_date = datetime.datetime.strptime(config['StartString'],'%Y%m%d')