Uses an inet.Dialer

this is the type of assumption we shouldn't violate.

See https://github.com/jbenet/go-ipfs/issues/153#issuecomment-63350535

fix(core) bootstrap panic

@jbenet @mappum

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

feat(core) supervise bootstrap connections

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

* only bootstrap if the number of active connections falls below a given threshold
* when bootstrapping, connect to a subset of peers

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

feel free to contest/revert if this becomes a problem

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

to improve SnR. Feel free to contest these changes if you find these
statements useful. In my experience, they were adding noise at Info.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

+/- if len(addresses) is 0, connSetup will be called with nil value for c.
+/- avoid variable reassignment

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

for higher SnR at IPFS_LOGGING=info

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

having an error return value makes the interface a bit confusing to
use. Just ponder... What would an error returned from a predicate
function mean?

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

refactor(peer) some _minor_ safety features

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

for safety!

use mockpeer.WithID methods to create peers in tests

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

feat(bootstrap!) add saturn, neptune, pluto, uranus

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

prevent sending of same block to a peer twice

Updated Datastore, to have a Has.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>