Some plugins may support network discovery, but may not be able to clearly
identify a device and return a list of discovery results that may
be the device, but also may not. As this breaks some app flows they
will be marked as "weak" discovery and can be excluded from said setup
wizards.
NOTE: This commit does not bump the API version even though it should
to avoid merge conflicts with other branches that do bump the version.
This allows JsonHandlers to set a hash for certain API calls.
Clients can use this information to load data for such a call
from a cache instead of calling the method over the network
just to get the same result as last time.
