tests: starting point for stress testing

This starting point for stress testing. Generates 200 files each
with 10000 random access rules. Does not yet support modify rules.
Next step would be probably making this more parametrized.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Add dictionary for labels

Add dictionary for labels to avoid memory allocation
for the same label for multilple times.
Dictionary is common to all labels in a single rules set.
Each rule only keeps ids of labels in a dictionary
instead of whole label as a string.

Signed-off-by: Jan Cybulski <j.cybulski@samsung.com>