PowerDNS 4.7 is supporting 2 new zone types: "producer" & "consumer"
Due to the domain type variable is limited to 6 chars, PDA Zone update will fail if producer or cusomer zones exist.
To solve this problem, this commit increases the lenght of the domain model type variable to 8 chars.
When enabled, forbids the creation of a domain if it exists as a record in one of its parent domains (administrators and operators are not limited though).
This increases data inconsistency and also performance of the whole
update process: SqlAlchemy can use its own caching better with a single
transaction as it does not need to mark already fetched objects as dirty
and so re-fetch them again on later use. So after deleting a domain,
we can still use the previously fetched domain objects for the update
operations afterwards. Otherwise SqlAlchemy had to fetch each domain
object again with single SELECT statements which leads to bad
performance with many domains (>> 1000).
The introduced "do_commit" variable controls whether the database
changes are to be committed by the caller or in the called method
itself. So we can use a single transaction for the Domain.update()
method while still preserving the previous behavior for other callers.
Closes#428.
The new setting 'verify_ssl_connections' tells the requests library to
verify secured outgoing HTTP connections.
Usually verifying is desired and helps to reveal configuration
problems. It also disables an ugly warning when HTTPS connections
are made without verification.
