Use MicroDescriptors - Githubissues

oppy should use microdescriptors.

This means modifications and updates in a number of places:

Update netstatus to use microdescriptors
- in the process, implement the correct download algo from dir-spec.txt
Update path selection to use microdescriptors
- we can't check the actual exit policy anymore, just have to guess
- support the "!node" argument, so we can choose a different exit if one fails
Update circuit to support microdescriptors
- can't check actual exit policy anymore in canHandleRequest
Update stream to support microdescriptors
- if we get a RelayEndCell immediately after sending a RelayBeginCell, a stream will now need to request another circuit to try (that doesn't use the exit node that just failed)
Update circuitmanager
- need to support the "!node" argument for exit request from stream
Update circuit build process
- we don't have the real descriptor anymore so update a few fields
possible requires minor crypto updates?
update unit tests for affected packages
write unit tests for stream package

nskinkel / oppy