Make s_client integration tests run additional --tls13 flag tests (#1769)
Make s_client integration tests run additional --tls13 flag tests (#1769)

* Make s_client integration tests run additional --tls13 flag tests

- this tests potential regression when server is run serving
  tls12 connections with existing test cases
- also add improvement to s_client tests, allowing additional args
  --debug for printing process command arguments
  --dryrun for running through test scenarios without running them
- now keeps a count of all tests that has run
- passes additional options as key value arguments, allowing easier
  extensibility in future

colmmacc/s2n,awslabs/s2n,awslabs/s2n,PKRoma/s2n,awslabs/s2n,colmmacc/s2n,wcs1only/s2n,awslabs/s2n,PKRoma/s2n,PKRoma/s2n,wcs1only/s2n,wcs1only/s2n,wcs1only/s2n,wcs1only/s2n,wcs1only/s2n,awslabs/s2n,PKRoma/s2n,wcs1only/s2n,PKRoma/s2n,colmmacc/s2n,PKRoma/s2n,colmmacc/s2n,PKRoma/s2n,colmmacc/s2n,awslabs/s2n,PKRoma/s2n,wcs1only/s2n,colmmacc/s2n