Enable testing on sudo + fix several issues

[IgorTodorovskiIBM]

• Enabled testing (confirmed it does not require root access - it runs a set of C unit/regression tests) Test status is:

  actualFailures:23
  totalTests:261
  expectedFailures:23'
  VERBOSE: 'Test results: 238 tests pass out of 261 tests - 91.19% success rate'

• The above results depend on https://github.com/ibmruntimes/zoslib/pull/20 going in
• I have also expanded setup.sh so that it can install properly the sudo tools under root
• Changed default ROOT id to BPXROOT for z/OS (also needed for tests)