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* feat: move options to main package and make internals private

Rationale:

1. This allows us to make private options for testing.
2. This removes an import for DHT users.
3. This makes options much easier to discover.
4. This makes it possible to make the config/options internals private.

We originally put them in a sub-package to avoid poluting the root namespace,
but that isn't really necessary.

This keeps the old package (for now) to avoid breaking too much.

* created Mode(ModeOpt) option for choosing between auto/client/server modes
* Auto mode internally switches the DHT between client and server modes based on the EvtLocalReachabilityChanged event emitted on the event bus (e.g. by AutoNAT)
* routing table management of peers that switch between client and server mode while we are connected to them (i.e. are in auto mode)
* removed Client(bool) option, becoming a DHT client is specified using Mode(ModeClient) instead

* feat: consume identify events to evaluate routing table addition
* fix: routing table no longer gets an update just because new messages have arrived or been sent
* fix: add already connected peers into the routing table before listening to events
Co-authored-by: Raúl Kripalani <raul.kripalani@gmail.com>
Co-authored-by: Aarsh Shah <aarshkshah1992@gmail.com>

options: KValue and AlphaValue global variables no longer used internally. Concurrency option now sets alpha. DisjointPaths option now sets d. Default number of disjoint paths is now bucketSize/2.

go 1.14 is now required anyways

* feat: Expose the ProviderManager through the IpfsDht struct
* feat: expose providers prefix so that we do not have to hard code it in other places
Co-authored-by: Aarsh Shah <aarshkshah1992@gmail.com>

License: MIT
Signed-off-by: Henrique Dias <hacdias@gmail.com>

License: MIT
Signed-off-by: Henrique Dias <hacdias@gmail.com>

License: MIT
Signed-off-by: Henrique Dias <hacdias@gmail.com>

We'd like to be able to refresh then _wait_ for the refresh to finish in the testground DHT tests. That way, we can:

1. Start and disable _auto_ refresh.
2. Bootstrap.
3. Refresh a couple of times till we're stable.
4. Wait to _stop_ refreshing.
5. Disconnect from and forget about all peers _not_ in our routing tables.
6. Run the actual tests without interference from the bootstrapping logic.

fixes #274

Update deps:

* Switch to multiformats/go-base32
* Regenerate protobuf decoding code

As pointed out by raul, bootstrapping and refreshing are not the same thing.
Bootstrapping is the initial setup (i.e., connect to some initial nodes to get
started). Refreshing is the process of refreshing the routing table.

* Rename triggerAutoBootstrap to autoBootstrap. This variable used to control
_triggering_ only but now completely disables automatic bootstrapping.
* Remove the BootstrapConfig. We introduced this before we switched to
functional options. Now that we're breaking the interfaces anyways, we might as
well use functional options all the way (easier to extend).
* Always query self (feedback from @raulk).
* Important: don't abort the bootstrap process if we timeout finding ourselves.

1. Auto bootstrap on start.
2. Make `Bootstrap(ctx)` trigger a bootstrap but not _start_ the bootstrapping
   process.

1) on connecting to a new peer  -> trigger self & bucket bootstrap if RT size goes below thereshold
2) accept formatting & doc suggestions in the review
3) remove RT recovery code for now -> will address in a separate PR once #383 goes in

changes as per review

2) seed RT if empty before starting bootstrap incase 1 hasn't fired
3) pass bootstrap config as option while creating Dht
4) replace all bootstrap function with 1 function

Implement striped locking for datastore puts.

Add initial set of metrics exposed via OpenCensus.

* Add IpfsDHT.{Bootstrap{Random,Self},Peer{Id,Key}}
* Include client mode tests, support for Ping, and uncruft setupDHTs
* Include xerrors in deps