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1. Continue to best-effort provide, but still return an error when we fail to
send provider records to the _best_ peers.
2. Continue returning the best peer's we've found in GetClosestPeers, but also
return an error to indicate that we didn't find the closest ones.

And fix the hang test.

* 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.

query switches from alpha mode to k mode if no peers closer than one we have heard about (in a given path) has been found

fix Search/GetValue to be Kad compliant. Default quorum is now 0 which means do not abort the query early

chore(ci): switch to go 1.14

go 1.14 is now required anyways

build(deps): bump github.com/libp2p/go-libp2p from 0.5.2 to 0.6.1

Bumps [github.com/libp2p/go-libp2p](https://github.com/libp2p/go-libp2p) from 0.5.2 to 0.6.1.
- [Release notes](https://github.com/libp2p/go-libp2p/releases)
- [Changelog](https://github.com/libp2p/go-libp2p/blob/master/NEWS.md)
- [Commits](https://github.com/libp2p/go-libp2p/compare/v0.5.2...v0.6.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* test: augment TestProviderManager test, add notes of future tests
* refactor(provider-manager): order funcs, update names for consistency, add code docs

* 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>

build(deps): bump github.com/ipfs/go-datastore from 0.4.2 to 0.4.4

fix: obey the context when sending messages to peers

Close context correctly

add benchmark for handleFindPeer

give views names again

metrics: record message/request event even in case of error

Merge pull request #470 from libp2p/dependabot/go_modules/github.com/multiformats/go-multiaddr-0.2.1

build(deps): bump github.com/multiformats/go-multiaddr from 0.2.0 to 0.2.1

Bumps [github.com/multiformats/go-multiaddr](https://github.com/multiformats/go-multiaddr) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/multiformats/go-multiaddr/releases)
- [Commits](https://github.com/multiformats/go-multiaddr/compare/v0.2.0...v0.2.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

fix(dialqueue): fix a timer leak