Improve FQDN handling in DNS and host plugins

DNS and host plugin does not work well with domain names ending
with dot. host plugin creates a record with two fqdn attributes
when such hostname is created which then has to be manually fixed.
DNS plugin handled zones with and without trailing dot as two
distinct zones, which may lead to issues when both zones are
created.

This patch sanitizes approach to FQDNs in both DNS and host plugin.
Hostnames are now always normalized to the form without trailing
dot as this form did not work before and it would keep hostname
form consistent without changes in our server/client enrollment
process.

As DNS zones always worked in both forms this patch rather makes
sure that the plugin works with both forms of one zone and prevents
creating 2 identical zones with just different format.

https://fedorahosted.org/freeipa/ticket/2420

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