Add capability to blacklist certain config property

This can be tested now. Please help me find any remaining corner cases I might have missed.

I have added a new field under the form. The field will have the only property specific blacklist config.
With the new changes, the property will not be unset but will be left blank.

The feature requests will be accepted against major branch

abhisekmazumdar → closed merge request !6

I have created a new MR for 2.0.x and closed the old one.

This is open for review now.

PR has been merged to 2.0.x

naveenvalecha → closed merge request !9

Automatically closed - issue fixed for 2 weeks with no activity.