Description of problem:
The enable/disable test option does not work properly after the first run.

The user cannot change a test’s enable/disable status after the kit has run
once, no matter if that test was run or not.

Version-Release number of selected component (if applicable):
HTS 5 release 14

How reproducible:  This is an example using the virt test

  hts discovery
  hts plan
  hts print
disable Test:
  hts plan --disable --test=virt
Try and run test, when you shouldn’t be able to  (it only runs INFO, which is
correct)
  hts certify --test=virt
Enable Test:
  hts plan --enable --test=virt
run the test again to show that is truly disabled:
  hts certify --test=virt

  
Actual results:

Never enables test, nor runs the test.

Expected results:

It should enable the test.

Additional info:

The testkit seems to be grabbing the enable/disable parameter from the
/var/hts/results.xml file, instead of from the /var/hts/config.xml file.  The
config.xml displays what it is supposed to run, while the results.xml file
displays what was previously run.    

The “disabled=’true’” entry in the results.xml must be deleted for the test to
be enabled.