DNS Policy form fix and load balancing fix

[R-Lawton]

Fixed:

• Form view they are less squshed and have even margins between the form groups etc
• Load balancing isn't required so that's now optional
• Made load balancing an extendable section like health check since it is optional
• Made it so that validation checks if the extendable sections are open and if values are filled in for greying out the create button. It also allows them to stay open when going from yaml to form
• Load balancing cant be edited so greyed that out in edit mode

[openshift-ci]

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[jasonmadigan]

/lgtm