run each test twice

[AskAlexSharov]

reason: some methods (like eth_getBlock) have internal LRU cache. 1st call will go to db, 2nd call will go to cache.

[lupin012]

-l,--loops: options all selected tests are repeated number of loops times

./run_tests.py -a eth_getLogs -t 1 -l 3 -v 1 [runs test1 of getLogs() 3 times and print the results]
Run tests in parallel on localhost:8545/localhost:8551

Test iteration: 1
0657. http ::eth_getLogs/test_01.json OK

Test iteration: 2
0657. http ::eth_getLogs/test_01.json OK

Test iteration: 3
0657. http ::eth_getLogs/test_01.json OK

Test time-elapsed: 0:00:00.036571
Available tests: 1203
Available tested api: 108
Number of loop: 3
Number of executed tests: 3
Number of NOT executed tests: 0
Number of success tests: 3
Number of failed tests: 0

if you need something different add new note and I can implement