Minor fixes to external test process. (addresses #298)

- Skip diffing of debug.log always.
- Skip diffing of reporter.log if it only contains an error about
  missing GeoIP support.
- Canonicalize X.509 Distinguished Name subjects since that can vary
  depending on installed OpenSSL version.

testing/external/scripts/diff-all

@@ -22,7 +22,16 @@ files_cwd=`ls $@`
 files_baseline=`cd $TEST_BASELINE && ls $@`
 
 for i in `echo $files_cwd $files_baseline | sort | uniq`; do
-    if [[ "$i" != "loaded_scripts.log" && "$i" != "prof.log" ]]; then
+    if [[ "$i" != "loaded_scripts.log" && "$i" != "prof.log" && "$i" != "debug.log" ]]; then
+
+        if [[ "$i" == "reporter.log" ]]; then
+            # Do not diff the reporter.log if it only complains about missing
+            # GeoIP support.
+            if ! egrep -v "^#|Bro was not configured for GeoIP support" $i; then
+                continue
+            fi
+        fi
+
         if ! btest-diff $i; then
            echo "" >>$diag
            echo "#### btest-diff $i" >>$diag