feat: Allow domain and global section records for ansible inventory

[Tiboris]

feat(AnsibleInventory): Allow additional domain level ansible inventory values

Add support for domain level ansible_inventory records which
can be eventually overwritten by host defined values.
Added unit tests to test this feature.   

feat(AnsibleInventory): Allow additional global level values

Add support for global level ansible_inventory records
which can be eventually overwritten by domain and host defined values.
Minor fix of logig in pytest multihost code - adding deepcopy.

test(AnsibleInventory): global level output values override

Add test for the feature to support global level
ansible_inventory records which can be eventually
overwritten by domain and host defined values.

Signed-off-by: Tibor Dudlák <tdudlak@redhat.com>

[Tiboris]

I can easily remove the multihost part if that would help to ship the ansible part required by users :innocent:

[Tiboris]

Removed multihost changes

[Tiboris]

Thanks for review :)