Cosmetics. Fix template image fields description.
Move UCI mgmt_net.tinc_gateway -> node.tinc_gateway
Separate default_connect_to on hosts, nodes and servers (#236 note-42).
Merge branch 'feature236'
Set default_connect_to on existing hosts.
Implement HTTPS support for retrieving node API.
Refactor SSLAdapter to use arbitrary SSL version.
Fixes #585. Check node API certificate if using HTTPS.
Handle SSL error on certificate verification.

* Extend State model to store ssl_verification.
* Warn user if state retrieval can be from a untrusted source.
Parse node response when cames from an untrusted source.
Show SSL cert verified on UI and controller API. refs #585
Extend state controller API to include data and metadata. refs #460.