[test] move legacy-vs-blobs graphing to benchmark scripts dir

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+Ploggin Legacy vs Blobs results
+===============================
+
+This script produces a bar graph comparing different implementations of the
+mail pipeline (legacy, blobs, blobs with session cache, blobs with session
+cache and persistent http connections) for different amount/sizes of incoming
+data (1 x 10M, 10 x 1M, 100 x 100K, 1000 x 10K).
+
+Data acquisition
+----------------
+
+Data was gathered through different runs of the code in
+`soledad/tests/benchmarks/test_legacy_vs_blobs.py`. As these tests are skipped
+by default, you have to (1) remove the @pytest.mark.skip decorator and (2)
+remove the second call to pytest in `tox.ini` that would cause a second run of
+the tests for measuring memory. This script only plots time, for now.
+
+Once you done the above, chdir into `soledad/tests` and do something like this,
+for each test group:
+
+  tox -e benchmarks -- -m benchmark_test_legacy_vs_blobs_10_1000k --benchmark-autosave
+
+Each run of tox as above produces a JSON file in `soledad/tests/.benchmarks`
+with stats. Each file has to be copied in a subdirectory of the `data/`
+directory of the folder where this script lies. Code has to be adapted for each
+extra set of results added to the `data/` directory.
+
+Currently, we are comparing 4 implementation variations:
+
+  - data/no-cache: contains legacy as baseline and blobs as the current master
+    implementation of blobs.
+  - data/cache: adds twisted session cache to blobs connections.
+  - data/persistent: adds session cache and persistent HTTP connections.
+
+Plotting
+--------
+
+Once you have all your data in subdirectories of the `data/` directory and the
+script is correctly tuned for your data, running `make` should be enough to
+create a virtualenvironment with dependencies and plotting data.
+
+By default, the script will generate a file called `./legacy-vs-blobs.png` in
+the current directory with the plot of the data.