Add a new method add_host_with_statements

[sagarun]

We want to set hostname, routers and domain in the dhcp lease file.
The method add_host_with_statements accepts router,domain and hostname
and sets those statements using omapi in the lease file. The method
also handles case when any of the statements are missing.

[cygnusb]

Thanks for your contribution. Please provide a pull request without the version bump. Thanks!

[sagarun]

@cygnusb Done. Thanks.

[cygnusb]

Please create one clean merge request containing only the minimal changeset and not version change and revert of version change. Thanks.

[sagarun]

@cygnusb I did revert the version bump. Do you see it? If you'd like to merge this as a single commit, you can 'squash merge' it. If not i can make this into a single commit. Let me know.

[sagarun]

@cygnusb Just made it into a one clean commit now. Removed the version stuff.

[cygnusb]

Please change the function parameters to not be kwargs. For the optional parameters you can use None as default value.

[sagarun]

@cygnusb Yes. I have removed the kwargs.

[cygnusb]

Please add documentation for all parameters. See other functions as reference

[cygnusb]

And please reorder parameters, to be in sync with def add_host_supersede_name.
Wouldn't it be better to name this function add_host_supersede and have multiple optional parameters be present?

[sagarun]

@cygnusb reordered the parameters, renamed the method to add_host_supersede, added doctrings about the parameter types. Thanks for taking time to review. Let me know if you want me to change anything else.

[cygnusb]

The check for name, ip and mac is now obsolete and can be removed. In addition also the "if ip" statement below can be removed.
Afterwards I think this can be merged. Thanks!

[sagarun]

@cygnusb Done. Thanks.

[cygnusb]

Thank you!

[sagarun]

@cygnusb Any chance it will get pushed to pypi? I still see 0.6 in pypi, can you make a release please?