Fix Enum IValueInfos with default specified.
Implement special IInitiatorFactory for running singleton tasks.

It internally holds the information about the current state and
decides when the next protocol should be run.
Support this on the backend side.
Use new Singleton protocol factory in nagios agent.

Remove the old style approach which kept information in agents state.
Merge branch 'release-0.29.x'
Define methods to access to the headers and body of the Request and Response
of the feat's webserver.
Don't store extra body second time. Change the concept to call
IWebStatistic.request_finished() before finalizing the request,
which closes all the descriptors.
Change configuration of SSL context to also allow v2 method.
Pep8 fixes
name check zip with revision
build prerelease