DynectSession creation isn't thread-safe so we need to lock around it

It's actually session creation that isn't thread-safe so we need to lock around
that.

Multi threaded planning

They apparently should be called on class objects rather than on instances.
I ran into thread-safety problems (eating data) before this change.

/cc http://pyyaml.org/ticket/36 which mentions those methods not being
thread-safe, but that PyYaml itself should be.

Fix octodns-* command warning, improve log messages a bit

First pass documentation for records and config for providers

Update to an active code of conduct, move contibuting

Initial import of OSS OctoDNS