A previous change reused the same timeout for dialing as well as
requesting in order to speed up some tests. This change introduces
a distinct timeout so that the different operations can have different
timeouts.
Adds a new `Info` method to the Kademlia endpoint that returns the following local node info:
* ID
* Type
* Metadata (email and wallet)
* Restrictions (free storage and bandwidth)
The new endpoint is exposed as `inspector kad node-info` command too.
