Added a -hcl2-strict flag to allow for lenient hcl variable parsing.

[apollo13]

@jrasell Hi I have added a -lenient flag to allow users to enable non-strict parsing of the job variables. What do you think?

closes #11164

[jrasell]

Hi @apollo13; thanks for this and sorry it took so long to get around to it. Internally we discussed the flag name and opted for hcl2-strict as lenient felt a little vague and this keeps consistent with the hcl1 flag naming style already in place. I have pushed some changes which modify the flag name, fixed the test failures, and update the documentation. As I have now pushed to this PR I cannot approve and merge, therefore have tagged @lgfa29 for this.

[apollo13]

Thanks for getting to this @jrasell -- much appreciated. I am fine with the new naming I just didn't want to solely complain, that is why I added code in the first place :) The new patch looks great and I will try it later today.

[apollo13]

Patch works great!

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