Cleaned up test_pywbem_server.py
Cleaned up test_pywbem_server.py

Details:

* Renamed testcase arrays and test functions to have 'pysvr' in the name
  so they become unique and can be specified in the TESTCASES env var.

* Removed unnecessary testcase parameter init_args for the create_connection()
  testcases.

* Improved description of testcase structures and test functions.

Signed-off-by: Andreas Maier <0903150dae73adcf31eccfd2633bf70bbc40bd52@gmx.de>

pywbem/pywbemtools,pywbem/pywbemtools