Fix issue 36. Give each unit test a fresh configuration context - helps tests pass when a config file is passed in, which can

mess up the "expected" output, as this is testing loading
values into the configuration system.

src/conf-yaml-loader.c

@@ -302,6 +302,9 @@ rule-files:\n\
 default-log-dir: /tmp\n\
 ";
 
+    ConfCreateContextBackup();
+    ConfInit();
+
     ConfNode *node;
     ConfYamlLoadString(input, strlen(input));
     node = ConfGetNode("rule-files");
@@ -326,6 +329,9 @@ default-log-dir: /tmp\n\
         i++;
     }
 
+    ConfDeInit();
+    ConfRestoreContextBackup();
+
     return 1;
 }
 
@@ -342,6 +348,9 @@ logging:\n\
       log-level: info\n\
 ";
 
+    ConfCreateContextBackup();
+    ConfInit();
+
     ConfYamlLoadString(input, strlen(input));
 
     ConfNode *outputs;
@@ -393,6 +402,9 @@ logging:\n\
     if (strcmp(output_param->val, "info") != 0)
         return 0;
 
+    ConfDeInit();
+    ConfRestoreContextBackup();
+
     return 1;
 }