[UNDERTOW-1848] SimpleSSLTestCase fails on Windows

[rmartinc]

Issue: https://issues.redhat.com/browse/UNDERTOW-1848

Changes in the test:

• Reduce the load depending the #CPU in the box. The concurrency is set to #CPU*8 up to 32 (before it was always 32 threads). The idea is reducing the number of simultaneous requests when the box has less than 4 CPUs to not stress too much.
• The SO timeout of the socket has been increased from 5s to 60s (exception java.net.SocketTimeoutException: Read timed out).
• The total await time was changed from fixed 70s to a while that waits for 10s and counts processed requests. The test stops if failed or if in that period no requests were processed. This way there is no hard time limit.

I have tested the class a lot of times in my VM and no failures even with only 1CPU assigned (which takes 3-5 minutes in each test). But who knows... Let's see if this is enough for the CI...