Remove parallel option

[eshulman2]

parallel option is default behavior of tempest and there is no need to specify it.

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[raukadah]

@kopecmartin @lpiwowar Hello, Please have a look at this pr, thank you :-)

[eshulman2]

@lpiwowar maybe we should close it for now and go back to the parallel thing when we have time

[lpiwowar]

@eshulman2 I think we can go forward with this PR but it should be followed with PR for test-operator that removes the parallel option from the Tempest CR as well. Once I see that there is PR for the test-operator as well then I would give +1.

It's up to you if you want to invest time in this right now. If not then I think it is ok to leave it for now:).