update hosts for regalaxy

[martenson]

and remove from gitignore
closes #197
xref CESNET/pulsar_node#21

[martindemko]

This changes the inventory_hostname in the playbook, which is also used for SSL certificate requests. This change as it is would effectively remove the alias from the use (see here)

[martenson]

@martindemko good point, I suspect there may be other problems too, I appreciate the review

[martindemko]

I guess, this should work, but we cannot be sure before the server maintenance after merging the branches.