* p2p: extract ID validation into a separate func
- NewNetAddress panics if ID is invalid
- NetAddress#Valid returns an error
- remove ErrAddrBookInvalidAddrNoID
Fixes#2722
* p2p: remove repetitive check in ReceiveAddrs
* fix netaddress test
* add actionable advice for ErrAddrBookNonRoutable err
Should replace https://github.com/tendermint/tendermint/pull/3463
* reorder checks in addrbook#addAddress so
ErrAddrBookPrivate is returned first
and do not log error in DialPeersAsync if the address is private
because it's not an error
* Require addressbook to only store addresses with valid ID
* Do not shut down peer immediately after sending pex addrs in SeedMode
* p2p: fix#2773
* seed mode: use go-routine to sleep before stopping peer
* validate reactor messages
Refs #2683
* validate blockchain messages
Refs #2683
* validate evidence messages
Refs #2683
* todo
* check ProposalPOL and signature sizes
* add a changelog entry
* check addr is valid when we add it to the addrbook
* validate incoming netAddr (not just nil check!)
* fixes after Bucky's review
* check timestamps
* beef up block#ValidateBasic
* move some checks into bcBlockResponseMessage
* update Gopkg.lock
Fix
```
grouped write of manifest, lock and vendor: failed to export github.com/tendermint/go-amino: fatal: failed to unpack tree object 6dcc6ddc143e116455c94b25c1004c99e0d0ca12
```
by running `dep ensure -update`
* bump year since now we check it
* generate test/p2p/data on the fly using tendermint testnet
* allow sync chains older than 1 year
* use full path when creating a testnet
* move testnet gen to test/docker/Dockerfile
* relax LastCommitRound check
Refs #2737
* fix conflicts after merge
* add small comment
* some ValidateBasic updates
* fixes
* AppHash length is not fixed
