Inventory > support filtering of inventory groups that are created from tags (#98)

[slmjy]

1. trimming long group names
2. supporting exclusion of tags from grouping (some tags can have 1 unique value for each host. Such inventory becomes unusable almost in AWX or Ansible Tower)
3. supporting creating groups from specific tags only

[europ]

More than half year has passed without any update.
@dineshsuthar786, @sagar2938 can you please review this PR?

[dineshsuthar786]

@europ Thanks for asking. We are internally working on this issue and we have a different approach to solve this. Due to some other priorities, we are not able to actively work on this. We will pick this up in future and update you.