Add net/data to directories that should cause analyze.py to run tests.

Review URL: https://codereview.chromium.org/593833002

Cr-Commit-Position: refs/heads/master@{#296042}

testing/buildbot/trybot_analyze_config.json

@@ -22,6 +22,7 @@
     "exclusions": [
       "chrome/test/data/.*",
       "content/test/data/.*",
+      "net/data/.*",
       "tools/clang/scripts/plugin_flags.sh",
       "tools/clang/scripts/update.py",
       "tools/clang/scripts/update.sh",