fix(katib): Increase experiment batch-size (#93)

Increase experiment's batch-size in order for the experiment to perform 
less training and thus complete earlier. The UAT's role is to confirm that 
the controller works, rather than run a full experiment training.

Fixes canonical/katib-operators#211

tests/notebooks/katib/katib-integration.ipynb

@@ -172,7 +172,7 @@
  " \"python3\",\n",
  " \"/opt/pytorch-mnist/mnist.py\",\n",
  " \"--epochs=1\",\n",
- " \"--batch-size=64\",\n",
+ " \"--batch-size=16384\",\n",
  " \"--lr=${trialParameters.learningRate}\",\n",
  " \"--momentum=${trialParameters.momentum}\",\n",
  " ]\n",